How to service a Corona Inverter Heater

Having problems with your Corona Inverter Heater?.  Are you plagued with ongoing intermittent E4 and E1 Error Codes?. Well, the chances are that you need to service your Corona Inverter Heater and give it a good cleaning. Taking it to a Corona Distributor can be both time consuming and costly, and in some locations there are just no distributors who are interested in offering servicing to these heaters, so why not carry out the servicing yourself?.

Here we provided a step by step guide (complete with pictures & video) on how to strip down and service your own Corona Inverter Heater. As usual common sense safety rules apply, in other words whilst its perfectly legal (at least in the UK) to undertake this work for yourself, make sure that you are both confident and competent enough to follow this guide, if not then its probably better to leave it to a professional or check a community social media page for a local handyman willing to undertake the work.

However most competent handymen and DIY’ers who are capable of putting up a shelf or assembling flat pack furniture should be able to service their own Corona Heater for nothing more than an hour or two of their time, when following this step by step guide.

For those who require a little more detail, there is also a 1hr and 30 minute video which can be found the bottom of this page

Top Tip:- It often helps to take photos of your own along the way, using a camera or phone as you carry out the disassembly, especially if you choose to disconnect any wiring or piping to give easier access, this way, if you run into problems during the re-assembly then you can refer to the photos.

First of all, here are the tools that you will need:-

Pozi-Screw Driver, Pliers, Wire Wool or Fine Sandpaper, Dish Detergent, Oven Cleaner,  disposable gloves and a Vacuum Cleaner.

So lets get started. Sorry about the quality of the photos, but they were taken several years ago, using a low-res camera phone.

1) First of all, remove the screws holding together the front cover and hot air outlet grill. On some Corona Inverter heaters, the front cover and outlet grill are one part, with fixing screws on the sides. However, on other models (such as the Corona 3016) the cover and grill are two individual parts, each secured with two fixing screws. The main front cover screws on these models are located on each side, at the bottom of the panel, whilst the grill screws are located at each side and can be accessed once the main cover is removed. The following photo shows the one part cover, with side fixing screws.

Carefully remove the front cover, giving access to the Electronic control PCB, and the grey, metal encased Burn / Atomization chamber

Turn the heater around, and remove the four screws which secure the combined rear convection grill and fan assembly. Once the screws are removed, lift the panel up slightly to unhook it from its mounting grooves, and gently place it on the floor. Note that the actual fan, and its wiring also come away with the panel, so care should be taken not to stretch or damage the wiring or fan blades.

Next, locate the small electronic fuel pump which is found to the bottom right, under the control pcb. Using pliers, loosen and remove the pipe housing connector from the top of the pump. Once undone, the copper fuel pipe simply lifts out of the pump outlet nozzle.

Remove the single screw from the bracket mounting which holds the copper fuel feed pipe.

Return to the rear panel, and behind the previously removed fan assembly, are four additional screws. These hold in place, the main grey metal enclosure containing the burner.

Remove the rubber air pipe, which connects to the lower combustion fan unit in order to supply air to the burner.

With slight force, push the grey metal burn chamber enclosure upwards and forwards in order to unhook it from the rear panel, and once released you should be able to pull the enclosure forward, and out of the front of the heater. Be careful of the fixed wiring which is still attached to the underside of the enclosure, but there is just enough length on these wires to pull the enclosure just outside of the front of the heater and lie on the floor / bench in order to work on.

Disconnect, the two yellow wires which are fixed to the thermal switch on top of the grey metal enclosure, you may also find it a little easier to undo some of the plastic wiring loom clips to allow a little more flexibility in the cables running to the enclosure. Next remove the  side screws which hold the metal enclosure together in order to access the main atomization (burn) chamber,

Once the metal sides of the enclosure are removed, you will now be able to see and access the main burn chamber. On some models you will now also need to remove the round metal top on the burn chamber. To do this, pull up the two metal tab ‘ears’ which are folded down, and straighten them upwards, the top should now pull upwards over the tabs and you can remove it.

Using a long screwdriver, undo and remove the three screws which hold the burner plates onto the atomizer. There are two parts to this burner, which should just lift out, however be careful of the bottom part, which has a very thin, delicate gasket underneath it.

Give the two parts a very good clean in order to remove all of the carbon deposits. First I soaked them for several minutes in a mixture of hot water and dish detergent, and then used some foaming Oven Cleaner (Mr Muscle Brand in the UK) and an old toothbrush to completely scrub the mesh clean. Wear gloves at this point as not only is it a dirty job, but oven cleaner is caustic and can cause skin burns. Rinse completely after cleaning and allow to dry.

Inside the burn chamber, there are two small metal rods. One of these is connected by a thick wire and is the igniter and generally requires no cleaning. However there is also another curved metal rod at the opposite side to the igniter, which is the flame rod (Flame Detector or FLOD). This is effectively a sensor which sits in the flame in order to sense that the heater has successfully lit and monitor the flame and so over time can also quickly get covered in carbon which changes its Electronic Resistance and will eventually lead to the heater incorrectly thinking that the flame is not longer present – shutting down with ‘E1’ or ‘F1’ error codes.

Remove the flame rod, by firstly disconnecting the wire attached underneath, and then remove the single screw holding the rod bracket in place inside the chamber. It may be useful to take a photo at this point showing the exact original position of the flame rod, so it can be refitted in the same position.

Pull the flame rod out, and also scrub it with oven cleaner. Next use some wire wool or fine grit sandpaper and gently remove any remaining stubborn soot and carbon deposits and return the rod back to as much bare metal as is possible without damaging the surface. Rinse in cold water, dry and refit the flame rod back into the chamber – maintaining its original position.

Finally, give the burn chamber a good clean out with a vacuum cleaner. Whilst you have the Combustion Chamber apart, its also worth checking the bowl under the burner to check for rust / muck build up. The image below was emailed to us by “Mister B” and shows large amounts of build up, which caused combustion errors, eventually leading to the heater continuously shutting down. Using Dipetane Additive at the dose of 10 ml to every 4 Litres of heating oil should reduce the amount of this Carbon build up

Once everything has been cleaned and allowed to dry, carefully Re-assemble the heater, test and enjoy your newly serviced Corona Inverter Heater!.

I would also recommend (if you are not doing so already) that you filter any fuel (regardless of premium C1 paraffin or heating oil / kerosene) through a “Mr Funnel” filter in order to remove any water / dirt contamination and help to minimise future issues.

I’ve also recently (2019) found a fuel additive called Dipetane which seems to help reduce the amount of carbon build up in the combustion chamber when added at the dose of 10ml to every 4 litres of fuel, and so should help prevent a return of the error in the future. (Although annual checking & servicing should still be maintained).

For those who require a little more information and a better, more informative guide, there is a video below which shows the entire procedure. Thanks to Jon Porter for providing the Video link, and to “Porky Wizard” for producing the detailed 90 minute video!

If you are still encountering “E” or “F” based errors on your inverter heater, even after following the guide above, then its probably time to replace the flame rod with a new part. Alternative, a work around exists which restores the functionality of the existing Flame Rod and is described in the following video.

102 Responses to How to service a Corona Inverter Heater

  1. Jacob says:

    Thank You so much for this video, helped me and my Inverter works perfect now!!!!! Thank You!!!!!

  2. David Evans says:

    Thanks for very detailed and informative video showing dismantling and assembly of the Corona inverter heater.
    I have one of these units and am experiencing the co2 fault at start up and during running even though the room is well ventilated (I have tried running the unit in an open garage and the fault still persists)
    Have you any ideas on how to fix this problem I asume it must be the co2 sensor – I do not know where it is in the heater – I would be gratefull for any help with this problem.
    We live in a remote area of France and I try to fix everything myself – it is a personal challange and rewarding and also saves us money!
    I would hate to have to buy a new unit as when it’s working it gives us good immediate heat at a reasonable cost.
    Hope to hear from you soon

  3. admin says:

    Hi Dave,

    Unfortunately I don’t have access to either a service or workshop manual for these heaters, so my advice is based on purely on the experience of servicing and maintaining my own!. On the back of my Corona Inverter heater are two black shrouded ‘probe’ type sensors, one is located just under the metal grey rear fan intake grille, the other is located higher up towards the top of the heater. I believe that one of these sensors would be the room temperature sensor and the other, i’m thinking, would be the CO2 sensor, although which one is which isn’t immediately obvious just from their location.

    To make it a little easier, if you can follow the instructions above to stage 2 (where you can view the control circuit board), many of the external wires running to the control board have symbols or words printed on the surface of the PCB where they plug in, indicating the function that they perform, perhaps you can identify the CO2 sensor from these idents and then trace the sensor by following the wire from the control board?. I imagine it would be marked either as a “CO2 sensor” or “air quality sensor” where it plugs in on the control board. I imagine the sensor would have either two or three wires, so that narrows the search down a little.

    If you need any help with doing this, you are welcome to email me a close up, high res photo of the actual control board in your heater, and I will take a look and try and point you in the right direction. My email is admin(at) (replacing the word (at) with the conventional email ‘@’ symbol)

  4. Huw says:

    Thanks for your guide. I’ve been using heating oil in my Inverter for a while now and it struggles to start, I suspect a lot of soot in the burn chamber. I am planning on servicing it as per your guide – hopefully it this will restore it to its former glory!

  5. admin says:


    To be honest i’ve never come across any ignition issues when running on Heating Oil, and both of my heaters run fine on it, when they are used (which at this time of year is on a nightly basis), so I would imagine that your current problems are down to one of three possibilities

    (a) Fuel Quality – at this time of year its possible that your fuel vendor has had the same tank of heating oil all over the summer months – fuel demand obviously drops over the warmer months, and so fuel stands around for several months. Most fuel brokers store their fuel in underground metal tanks, the warm air / sun on the ground above causes condensation which forms on the sides / top of the tank and drips into the fuel. These tanks hold thousands of litres of fuel and the water contamination is tiny in comparison, and so in most cases it doesn’t cause a problem for traditional heating oil based systems. However these heaters are far more sensitive to stale / aged fuel and water content, usually resulting in ‘E4’ errors or difficult ignition. If you don’t have one already, I would buy a Mr Funnel type filter (which is designed to remove all excess water from fuel) and routinely filter the fuel through it everytime you fill the heater tank.

    (b) Fuel type – make sure that you are using the correct grade of Heating Oil. There are two types on the market, one is called 28 second Kerosene and the other is 35 second Kerosene. You need to be using 28 second heating oil (usually a light yellow colour), as the 35 second isn’t suitable for these heaters (it is effectively red diesel). Some fuel brokers can dual use their storage tanks also at different times of year, so it could be possible that the broker has previously stored another type of fuel (such as diesel) in the tank, which has slightly contaminated the existing fuel. If you have not already done so, it may be worth trying some fuel sourced from another fuel vendor.

    (c) Soot – you have already mentioned this as a possibility, and its good practice to clean out the heater at least once a year if it gets used on a regular basis. Pay careful attention to cleaning the Flame Rod and in your case it may also be worthwhile cleaning off any obvious carbon deposits on the ignitor, and gently sanding it with some very fine grit sandpaper. Ignitors, by design, are considered to be wear and tear items on any heater, so depending on the age of the heater and how much use its had, the ignitor itself may need replacing, if cleaning alone doesn’t solve the problem.

  6. Huw says:

    Cleaned and serviced – now my heater lights properly first time and runs great, possibly better than new..

    Oddly enough – my flame rod had another short bit of metal stuck to the side of it near the end exactly parallel to it, it snapped off just by using my fingers. I wonder if it was a manufacturing error. I took a photo just in case.

    David Evans – prior to servicing my heating and cleaningand servicing I too had intermittent problems with the heater cutting out after 10 minutes with a co2 error.

  7. Pete Calvert says:

    The E4 fault Video Was very very helpful, can you tell me where i can buy a flame rod for the Corona Inverter 506/509 Please ! I have looked on eBay and i have Googled it but cant find one anywhere, Can you help please
    Kind Regards Pete

  8. admin says:

    Try “Dry it Out” in the UK, they can supply most spares for these heaters, I think the cost of a replacement Flame Rod is around £20. The contact email I have for them is roger[at] – (replacing the [at] with the conventional email @ symbol) their phone number is 01588 620126.

    For spares elsewhere in Europe, try

  9. Peter Bird says:

    Hello, my Inverter 5096 keeps running out of fuel even when the fuel tank contains fuel. The low fuel alarm acivates then it shuts down. To me it appears to be pulling a vacuum in the fuel tank and once the negative pressure balances the weigh of the fuel in the tank, no more fuel will flow out of the fuel tank. Any suggestions anyone.

  10. admin says:

    Hi Peter,

    If your 5096 uses the same fuel dispensing process as my 3016 then its probably the spring loaded valve plunger in the cap on the fuel tank which is sticking. I’ve had several minor issues with mine, and I soon discovered that even when the peg on the strainer pushes the valve open, when the tank is in place, fuel sometimes doesn’t always flow, and I have to remove the tank and depress and release the plunger on the cap a few times before fuel flows into the reserve tank at the bottom of the heater.

    I can imagine that its possible that something similar is happening here, fuel stops being dispensed from a randomly sticking cap valve, eventually the small amount of fuel contained in the bottom reserve tank feeding the burner is exhausted, no more is fed from the main tank and the low fuel process begins.

    Try removing the tank cap, quickly flip the plunger open / shut a few times and then putting it back in place, it may be as simple as that, in which case a new replacement tank cap may solve the problem in the longer term.

    Failing that, it may be the float in the bottom tank which is intermittently misreading the level of fuel, and alse triggering the low fuel alert.

  11. Peter Bird says:

    Hello admin, thank you for your quick reply. I have had a few issues with the tank filler cap valve. Sometimes it does not close completely when I remove the fuel tank from the heater. I now keep a rag close by just in case I need to catch any leaking fuel. Since my first email I have removed and cleaned the lift out filter which sits on the top of the small fuel tank and given it a clean {though it did not appear to need any cleaning to me}. However, since cleaning the filter the heater has functioned perfectly. So fingers crossed etc.

    Thanks again,

  12. MisterB says:

    Hi, thanks for the instructions, I did also have another issue which was as follows.
    when I dismantled the burner I noticed a very heavy build of carbon/rust/gunk in the bottom of the receptacle under the filters. I didn’t clean this first time, just the ‘flod’ (flame rod) and spark igniter, filter etc. I still kept getting the E4 error message, so dismantled again and this time carefully chipped away at the built up deposit, hoovered it all out and reassembled. PERFECT !!!!! it might be worth adding to the tutorial to clean out the chamber under the filters aswell, to clear any carbon deposits etc.

    I suspect its down to the fuel i have been using, although its a premium fuel I suspect it is causing the problem, so i have now invested in a Mr Funnel filter – and I noticed bits of debris in the bottom of the filter that would have normally just gone straight into the heater and probably contributed to the build up of crud!

  13. admin says:

    You really shouldn’t be getting these issues running entirely on Premium Fuel, if there is any contamination in a newly opened premium fuel container, then you need to send it back to the Vendor.

    My two heaters have run on bog standard 28 second heating oil Kerosene for all of their working lives ( with an occasional dash of a specialist additive), and I service and drain them at the end of every Winter season, but even running on the non approved fuel I haven’t experienced any of these problems (hence no Tutorial so far), nor noticed any excessive build up of rust or general gunk, just the usual soot deposits which are expected through running a heater on a daily basis for six months. I have always used a Mr Funnel for every fill though, right from the start.

    Rust is obviously a clear indicator of water contamination, something which the Mr Funnel will remove, so hopefully you won’t experience the problem again. Its a bit of a concern that this has happened when running on Premium fuel though.

  14. Henk Peter says:

    I have exectly the same CO2 problem with my Inverter Mini Max (type SRE127) like David Evans on October 26, 2014 at 6:37 am. My heater (from 2007) is not exactly the same as shown in the video, but many parts look the same. I bought my heater in Italy and the manufacturer (or importer) is: Ligne Plus SA, Rue Pierre e Marie Curie, 15, 57260 Lezennes (France).
    I find the CO2 sensor. It is connected with 3 wires (red, blue and grey) with the main print. On that main print (or how do you call it in English) you can find the word “CO2″ directly next to the plug with the 3 wires I mentioned. The CO2 sensor itself is mounted on a print of about 2″x2” and called: CO2 Engine-FH 0502A828 (See dropbox link). It is placed -in my heater- left under directly behind the front panel.
    I think when I would replace the sensor my problem is over, but….
    How do I find a new one? I know the OEM-part manufacturer (it is printed on the sensor): SenseAir in Deisbo Sweden.
    but then I not get any further.
    Who can help?

  15. MisterB says:

    As an additional comment re the build up of crud, the heater had for some time become more and more difficult to ignite, the main symptom being that ‘puffs’ of vapour/steam were being emitted prior to ignition and being pushed out into the room by the fan. I thought it was possibly steam from any water in the fuel (though as it was a premium brand, ready sealed, I wasn’t sure how this could occur, unless I was storing it incorrectly?) I now suspect this emission was caused by the crud heating in the burner chamber as after having cleaned it out we no longer get that emission.
    So, if anyone else starts to experience the ’emission’ issues, then clean your combustion chamber!

  16. Henk Peter says:

    I received a respons from Essege the European distributor & importer
    “The CO2 engine is probably defect.
    If you live in Italy, I believe the easiest way for you to order a CO2 device is by getting in touch with our Italian colleagues:
    Tecno Air System Italia
    Via Piovega, 10, 31010 Paderno del Grappa (TV)
    Tel : +39 0423 948800
    In the meantime I found a local service center at 20km’s as well:

  17. admin says:

    Hi Henk,

    Thanks for the update, please let us know if replacing the CO2 engine cures your heater fault, as it may be useful for other heater owners in the future.

  18. Henk Peter says:

    Because I have 2 Inverter heaters I tested the CO2 Engine by exchanging them.
    First I checked if they are of the same type on both heaters (INVERTER 6747 and INVERTER MINI MAX) and they were.
    So now I am sure the CO2 Engine is defect.
    You can find the service centers in Italy on:

  19. Henk Peter says:

    I ordered the CO2-sensor (CO2 Engine-FH, with code EAN: 5420020084548) for my INVERTER MINI MAX (also suitable for other types like INVERTER 6747).
    It arrives in 10 days and costs €63 in Italy.
    The print with the CO2 sensor is easy to assemble. Remove the old print by squeezing the white nylon supports with pliers, remove the little plug with the red, blue and grey wires and install the new CO2 sensor in reverse order.

  20. admin says:

    Hi Henk

    Thanks for the ongoing updates and also the information in relation to a supplier and price for the replacement CO2 engine. Its good to read comments from people sharing information and helping each other on this blog.

  21. Erik says:

    Hi there,

    I just found these pages trough looking for co2 sensor problems (Zibro made by Toyotomi) . And while reading i was wundering what the biggest differences are between these two heating systems. i own two Zibro´s , they use a burnermat, is this the only big difference?

    Best regards

  22. mkn777er says:

    Hi there
    Just wanted to add my thanks for the very informative ‘step by step’ guide to servicing these heaters. Mine is a good few years old and recently started to become very smokey on start-up and shut-down. Decided it needed a service and found your guide whilst doing a Google search. The one used in the pictures is the very model I have, and it took me no more than an hour to clean it all out, re-assemble, switch on, and once again, heating perfectly.
    So thank you again!

  23. Huw Watkins says:

    I seem to have run in to another problem with my Kero heater. It seems fine when running full speed and heating the room up to temperature but when its there and backed down a little I’m getting spurts of yellow flame. This wouldn’t usually be a problem but its causing the flame to extinguish with an E2 error as shown in this video: (shows the yellow flame – not the e2 error)

    I’ve taken everything out and cleaned it again (not that there was much to do) but it doesn’t seem to have made any difference.

  24. admin says:

    That is just strange, i’ve never come across that problem before!. There is no audio on the video, so my first question is, does the tone of the heater change, around the time that the yellow flame appears?, any strange mechanical sounds? or a slight change in pitch from anything inside the heater.

    E2 represents a combustion error, have you checked the combustion chamber fan which is located underneath the burner?. It might be worth disconnecting the small rubber hose which connects the fan housing to the combustion chamber and supplies air to it. Check for cracks in the hose or loose connections, it may also be worth checking for any dust inside the hose and fan unit itself.

    The other thing to check and blow through is the fuel line between the little facet pump and the burner.

    If the above doesn’t solve the problem, i’m currently testing an additive called “Dipetane”, and whilst I am the first to admit being a huge sceptic when it comes to the benefit of any kind of snake oil additives, i’ve been adding it to the kerosene in one of my heaters for the last few months, and it does seem to be reducing the normal carbon build up, compared to the other heater (which is run without the additive). I’m not actively promoting the additive on the blog as yet, as its still early days and I want to continue testing for the rest of the Winter, but I came across it on a forum last year, with many people praising its cleaning properties in relation to aga’s and oil fired boilers. I’m thinking if there is a small issue or fuel related blockage somewhere, it may be enough to clean it through, it also professes to clean and lubricate pumps and moving parts. Its just a suggestion, rather than a direct recommendation.

    If you can’t find a stockist of Dipetane locally, it is for sale on E bay

  25. Huw Watkins says:

    Yes, the tone of the heater does change. There was audio on there but the heater is very quiet. I’m hoping that the fuel pump hasn’t gone again! There must be a way of refurbishing them.

  26. admin says:

    I’d be surprised / shocked if your pump has failed so soon (unless you are being sold some extremely poor quality fuel), as well as the advice already given above, perhaps try some ‘proper’ approved fuel? to see if this resolves the problem.

    Alternatively, (if it is the pump, but i’m not convinced it is) you could replace the pump with a standard multi-purpose facet type, these will pump anything, unfortunately its finding out the voltage and pumping capacity in order to replace it with a direct equivalent which would be the biggest problem.

    Out of interest, do you still have the old pump?, if you have the manufacturers information / part number on the pump then please post it up, and I’ll try and find out what the specification is.

    Incidentally, i’ve just tried the video again, with headphones on and the volume cranked up, the noise which occurs sounds just like the muffled boom you would expect from the flame disturbance, its not really a mechanical sound like something about to give up!.

  27. Huw Watkins says:

    Thanks for the reply. As well as the noise from the flame disturbance there is a slight pitch change the unit. Unfortunately it seems that my phone isn’t capable of picking it up.

    I still have the old pump. I will get some details and pictures of it tomorrow. I kept it with the intention of trying to take it apart.


  28. Huw Watkins says:

    OK – so I found the pump and decided not to wait untill tomorrow…this is the markings on the bag the replacement pump came in:

    The only markings on the pump unit:

    Wide shot of the unit:


  29. admin says:

    Yes it looks like a magnetic piston pump, very similar in its principle of operation to the aforementioned facet pump. These create a pumping action, using a very rapid push-pull action of a solenoid control arm or ‘plunger’. These pumps are generally fairly robust, and are used in everything from Coffee and Vending Machines, to Smoke machines. There are very few moving parts – just the plunger and parts associated with it, so it might be possible to repair the old one, and any local engineering company should be able to supply replacement mechanical parts, if you hand them the old ones to x-refer. If you do decide to have a try, also replace any gaskets or washers with new ones made of viton, as this material won’t shrink or react to any fuel in contact with it – including neat Kerosene.

  30. peter says:

    Serviced my corona as you described and fires up very quickly with no nasty smells and no more cutting out.cleaned out a lot of grunge and I have ordered a Mr funnel .many thanks

  31. Mister B says:

    Co2 sensor – hi, read through the posts and I seem to have the co2 sensor problem now (this is my heater in france not the gunked up one in the uk) – gave it a quick service and still get the co2 error. the co2 sensor is flashing intermittently when it tries to start up, is this normal or an indication its faulty? thanks

  32. Mister B says:

    after a few days trawling looking for info on the CO2 fault (which is probably really a CO fault) showing up, my brother in law found a couple of links via google – the first is the replacement CO2 sensor and lots of other spare parts –étecteur-de-co2-poêles-à-pétrole-inverter.html# the sensor is priced at 80euros, the second is a forum for the heaters – – it seems to be a common fault on NON UK models – UK models don’t have them, they fit below the main circuit board and are easily seen when removing the front cover, the main circuit board has CO2 detector printed on it where the wires connect it, so are they really required? I think not and anyway you could always just install a CO detector anyway! BUT and its a big BUT, there is a way to remove the sensor without it giving a CO2 fault , simply taking it off produces the fault code. it has three wires, red, blue and grey. leave the CO2 detector in place and snip the wires half way in between. then connect the blue and grey wires together and insulate them (aswell as the red wire of course!) as I said, for peace of mind you could always install a CO detector in the room the heater is being used, and perhaps you should do that anyway!

    I don’t want to get into a debate about the removal of a ‘safety’ item, when the safety item isn’t even used in the UK spec heaters anyway! its a simple fix and saves around £60 minus the cost of a CO alarm wherever you use the heater.

    ps just to conform the detector was faulty, I tried the heater outside, after fully servicing it, cleaning it thoroughly etc and after about 5 mins, it went into CO2 fault mode!

    when I tried the fix to bypass the sensor, it worked perfectly !

    I am not suggesting anyone does the fix of course, its just for information purposes only !

  33. jared says:

    Hi, I bought an inverter heater last year and successfully used it over the winter months; however, lately it is leaking into the bund and will actually overflow if I do not turn the heater off. I have serviced the heater recently – it was leaking before, and is still leaking after. I am thinking it may be the fuel tank cap – but it does not leak when it is not in operation. Any ideas on how to remedy would be appreciated.

  34. admin says:

    As far as I know (from my own heater design) the filler cap has a spring loaded valve which dispenses fuel into the lower heater burner tank as the level drops, in the case of mine you can actually here the fuel ‘glug’ occasionally as the level drops and is replaced.

    I’m sure that the cap spring valve is opened by a simple locating peg in the bottom of the heater rather than any electrical solenoid or mechanical valve so it would be difficult to think of any failure that could occur. Unless there is come kind of internal float system attached to the peg? – that may be worth checking.

    Its very common for the spring valve in the filler cap to ‘stick’, I’ve experienced this on both of my heaters and have now got into the habit of jiggling the valve open and closed a few times after each fill of fuel, which has now cured the inevitable leak over the carpet when the tank was carried back to the heater!.

    The rubber seal in the cap is also known to wear, allowing fuel to leak around the sides. So it my be worth routinely replacing the cap anyway, if it is a year old.

    Other than that, I can’t think of any other problem which would cause the overfilling problem that you describe.

  35. gerard says:

    After my heater has been running for a while it stops and displays the code Ed, no explanation in the manual. I suspect it has something to do with CO2. I would appreciate if some one knows the problem and can explain / advise what remedies there are?

  36. admin says:

    Never come across an ‘ED’ Error Code on this blog before, I have a collection of several different manuals and there is nothing in any of them either. I suspect that these heaters have internal error indication which isn’t documented in the user manuals as they relate to non user serviceable items but the codes are still shown to aid the service engineer.

    Generally, if a fault relates to a CO2 problem, then often you will see a lot of yellow / orange appearing in the burner flame before the heater switches itself off, although that won’t help if its a faulty sensor, rather than a genuine ventilation problem.

    If you have had the heater a while it may be worth cleaning it, as described above as this does seem to solve a lot of errors

  37. Ellyan says:

    Hi i have fan heater mitsubishi . Error c9 . Can yiu help me please

  38. admin says:

    What is the actual model number of the Fan Heater?. This will be on a label on the actual heater, or on the front of the user manual.

  39. Joe says:

    Hi I have a 3200w inverter and after moving , I am getting an e0 error code, any ideas on how to fix this?.it’s done it before when I travelled the unit, and started working after a long time lying still , but winter here now .

  40. admin says:

    Joe – The E0 code in a Corona Heater usually translates to old or poor quality fuel, is the air intake at the back clear? How old is the fuel you are putting into the heater and how long has it been stored? – have you tried fresh fuel purchased recently?. If you are using standard kerosene in the heater then its worth buying a funnel called a ‘Mr Filter’ – usually available to buy on E bay, this filter not only removes tiny traces of dirt and rust particles which may be in the fuel, but it also removes any water contamination within the fuel, which can cause a lot of random errors in these Heaters, as well as causing rust in the burner and internal metal surfaces. Simply filter the fuel through the Filter as you fill the Heater Fuel Tank.

    Its always worth cleaning these heaters at the end of every Winter season as per the guide and video above, especially if they get a lot of use, before putting them away for the summer, I find that preventative maintenance goes a long way to solving a lot of problems. Given the fuel related Error code that you are getting, in addition to servicing and cleaning the burner, I would also carefully take off the brass / metal fuel line which is fitted between the internal pump and burner chamber and blow them through to make sure there are no blockages or dirt trapped inside, also clean the fuel tank and fuel filter / strainer where the fuel tank sits.

  41. Joe says:

    Hi thank you for the reply.

    The fuel is 2 to 3 years old. I will replace it
    And try blowing through the fuel pipe.

    I cleaned the unit internally but left the biting pot because of the fragility of the needle
    Can this cause an e0 error ?.
    Is there a way of draining the internal fuel reservoir ?.

    Many thanks


  42. admin says:

    I suspect that its the fuel that’s the problem, E0 generally means old or contaminated fuel, and your reply does indicate that the fuel is well past being suitable for use – at least in these types of heater. Kerosene has a shelf life of about 12 months, and that is when stored in a dark place, in an airtight container. Beyond that, the fuel starts to age rapidly, and will also absorb water, the older the fuel the more likely it is to cause problems, especially if its been exposed to air for any period, or badly stored.

    I’ve never attempted to empty the small reserve tank within the heater itself, and I don’t think that I would attempt it. Assuming the heater will light and run for a while between giving the Error code, I would run the heater with the main tank empty, so that the heater runs from the fuel in the internal tank – using it up. The heater will probably sound the low fuel alert and run at reduced output but it should run long enough to use up the fuel which is left to the point where the heater will shut itself down due to the lack of fuel. Normally this will take between 10 and 20 minutes of running.

    At which point you can fill the main tank with fresh fuel, there will still be a small reserve amount in the internal tank as the heater won’t allow itself to run dry, however it will be massively diluted by the new fuel to the point where it won’t create any problems.

    If the heater doesn’t run, or won’t run for long enough to burn off the fuel in the inside tank as I have advised above, then you will just have to fill the main tank with new fuel and hope it dilutes the existing fuel. The internal tank only holds a small amount of fuel, so it may be ok.

    Using new fuel, may immediately solve the problem, however I would still clean the internal fuel lines regardless.

  43. Joe says:

    Thank you very much for your help,
    I will give it a try and let you know the results


  44. Beyls Reginald says:

    Very nice video ,helped a lot ,E4 fault gone .
    Where can i buy a flame rod and other parts when needed??

  45. Dave Elborough says:


    I wonder if you could give me a bit of advice?

    I’m starting to get intermittent starts on my inverter 5096 with E0 error, I’ve checked the fuel filter and it’s looking pretty manky, I’ve tried cleaning it with an old tooth brush and paraffin but it’s not really doing anything!!
    Do you know of another method of cleaning or can you point me it the right direction for obtaining a new one, I’ve been all over ebay and amazon and managed to find only one seller who won’t post outside of the UK!!

    Brilliant article by the way, I’ve bookmarked it in my favorites!!

    Thanks in advance for any advice you may be able to give.


  46. admin says:

    Hi Dave

    Probably a stupid question (as you are commenting on the actual article) but have you also tried stripping down and cleaning the inside and the heater and burner chamber as detailed in the instructions and video above?.

    If not, its well worth spending a few hours following the guide since it does solve a lot of random ‘E’ based errors, and its generally good practice to routinely clean it before putting it away in the spring, assuming it gets a lot of use over the Winter!.

    You also mention that the fuel filter looked manky, what type of fuel are you using in this heater? and do you filter it before it goes into the heater?. If you don’t already filter, It would be good practice in the future to filter any fuel through a ‘Mr Funnel’ filter linked to in the article. This filter not only removes the usual dirt particles from the fuel, but also any water contamination absorbed into the fuel too, which can happen during storage and distribution of the Kero / Paraffin, helping to prolong the longevity of the filter and heater alike.

    The Corona 5096 Inverter Heater is exactly the same heater as the Corona 5006 model, so it may also be worth asking for a replacement Fuel Filter for a 5006 heater as they will be the same part.

    Edit – Following my Own Advice, i’ve managed to find a replacement Fuel Filter for a Corona 5006 / 5096 Heater here (Click Me)

    If my link takes you to the same retailer who won’t post outside of the UK, then also try Technoair System in Italy and SAV Meches and SAV Pem

  47. Dave Elborough says:

    Thank you, you are a life saver!!
    I’ve ordered a new filter from Sav Pem, I would never have found them.
    The only fuel you can buy here in Greece is pre-packed 18 liter canisters of Kerosine, it seems pretty clean but I’ve just ordered a Mr Funnel for future use.
    I’m going to strip the heater down this weekend and give it a good clean as per your instructions.

    Thanks again for your help, it is much appreciated!



  48. Derek Reynolds says:

    Hi, I have an ‘Inverter’ heater inherited from my Mother-in-Law which she bought in France. Nowhere does it say it is a ‘Corona’, but the images and details seen on your videos shows my heater to be identical externally and in general layout. The model is a 5710 with an output of between 800 – 3000 Watts with a 7.2litre fuel tank.

    It has come up with error E4 in the past, but a good clean has seen it working fine again. Today I am getting E6 after the unit has started up and run fine for 15 – 20 minutes, after which it shuts down. Referring to the manual this denotes an electrical fault “see your dealer”. Well, that’s not going to happen as it came from a supermarket chain in central France in 2003! It did get serviced in France at huge cost, but here in the UK I have stripped and cleaned the entire unit myself with no problems – until now. E6 does not tell me which component may be at fault other than an electrical fault. So I’m asking for some guidance on just what it may be, or, a distributor servce engineer within striking distance of Much Wenlock in Shropshire who may be able to help.

    Many thanks.

  49. admin says:

    Hi Derek,

    There is only one place that I can think of who could probably repair this for you, and that is an individual i’ve seen advertising in the online classifieds over the last few years, who I believe is a sole trader who repairs these heaters. Since the use of inverter heaters still tend to be a niche product in the UK there isn’t yet a service centre in every high street or even every County!.

    This business operates in Preston, Lancashire so its a few hours away from you, although I do think they can operate a collect / return service using a carrier service at extra cost. Sadly this is the only business that i’m aware of, who will go beyond just servicing these heaters (which is basically stripping down the heater and doing what I describe here for free).

    The phone number for the repair guy is 07988 774336 and his business advert is here. I must add however, that I have never contacted or used his business personally.

    In relation to the actual error described, an E6 fault, as you correctly state, is an Electrical Component Failure inside the heater. In the past and from experience of the various discussions here, these Electrical Failures have been found to be caused either by the CO2 sensor inside the heater, or by a component failure on the actual control circuit board itself, which needed the entire circuit board swapping out. Given that the heater runs for a while, then I would personally suspect the CO2 sensor, but that is just an assumption.

    One additional thing to check before throwing money at the problem. If you open the heater front, you will see the main control circuit board, with various wiring looms plugged into it, just below that (on some models), is a separate smaller circuit board, this is the CO2 sensor. Generally its only European models which have this additional dedicated CO2 circuit board present, and since your heater was originally purchased in France, its worth just checking if your heater has this fitted. If it has, then try cleaning out the actual sensor itself (usually a funny shaped ‘arch’ fitted across the circuit board), which has a fine gauze opening(s). The best way of cleaning the sensor, is to wipe it over with a dry lint free cloth, and then get a small can of compressed air (the type sold to clean computer keyboards) and give all visible openings in the ‘arch’ a really good blast with it in order to remove any dust or fluff – which can effectively block the sensor and cause false triggering of the protection system. If cleaning the sensor itself doesn’t solve the issue then the entire CO2 sensor board would probably have to be replaced, but sadly there is no real way of testing it first and without a service manual, it really is a process of elimination and working through the most obvious and commonly reported failure points first.

    Edit:- I’ve uploaded a picture of the CO2 Sensor PCB on the link below, to help you identify whether your heater has one fitted.

  50. Derek Reynolds says:

    Thanks for the image. I seem to recall seeing that similar image on another website, however, there is no such device inside my heater. It was originally purchased on the 11/01/2003, maybe CO2 sensors hadn’t swept the market back then.

    Just spent three and some hours taking the beast apart again, and cleaned the entire burner complex; the sparker; the flame bar; and the bottom fan. All squeaky clean, and she fired up and ran for 15 mins blasting out heat like a good’un – then E6 and shutdown.

    This was with the heater beneath an open window facing into the room. Fuel used has been 28sec heating oil for the past four years with no issues. I have been in email communication with Roger at Dry-It-Out, and whilst he had several recommendations, nothing so far has worked.

    Thanks for the link, Preston is a stretch, and Roger at Dry-It-Out is closer being in Montgomery. It’s not essential it gets repaired as it’s an upstairs booster which we can easily substitute with electric – but I’d like it working and not a shelf queen.

    Stripping the unit I discovered the sparker ceramic is cracked both sides at the ‘hot’ end, though I doubt this has any relevance to my E6. I may just give the chap in Preston a phone call, it needs to be examined that’s for sure.

  51. Derek Reynolds says:

    Should that be CO sensor? Either way it ain’t got one! We do have CO sensors in the house, and neither have ‘spoken’ to us yet . . .

  52. admin says:

    All of these heaters have sensors built into them, the idea being that if the Carbon Monoxide level in the room rises above a safe level, then the heater will automatically shut itself down. However the method of sensing seems to vary from model to model, some have a separate sensor PCB connected to the main circuit control board, whilst others have the sensing integrated into the main circuit board, making servicing and replacing the air quality sensing section less simple, as the entire main board will need replacing. It is possible to identify the failed components on the main board, but electronic fault finding, de-soldering components and re-soldering in new ones is fairly specialised and probably beyond most heater owners, so i’ve not covered that aspect on this blog. Generally its easier to just replace the entire main board (Which seems to be what the majority of distributors do), however fault finding and repairs at component level might be something that the Guy in Preston can do, so it might be worth a call since if it does turn out to be a Main Board issue a repair at component level is often cheaper than replacement.

    The built in sensors can and do go faulty, meaning that even though the Carbon Monoxide / Dioxide levels in the air are still safe, the faulty sensors send back incorrect readings causing the heater to shut off needlessly. There are a couple of comments higher up in this page, from Henk Peter and ‘Mister B’ which highlight the problem, and in both cases these were Heaters sold outside of the UK and both had the separate sensors. So it was worth checking at least.

    If the ceramic is beginning to break down on the Ignitor then its probably good practice to replace it (assuming the parts are still available), however I don’t think it will be the cause of the E6 fault, as the Ignitor is only active in order to spark a few times to ignite the burner at start up, it doesn’t play any part once the heater is running.

    Unfortunately my only other suggestion would be to have the Main Board checked out, and repaired / replaced if found to be faulty

  53. Derek Reynolds says:

    I have been advised of a diagnostic mode for this heater. It begins with unplugging the heater, and pressing and holding down the minus (or lower temp. adjuster symbol) and the timer button simultaneously – THEN with both buttons held down – plug in. The digital display will show (well it does on mine) b 30. Then – press start.

    The stove should fire up and go through a 10 minute range of heat levels. The second (right hand) figure should maintain a reading of 50, steady throughout the sequence.

    I ran this diagnostic program on my heater for a full 50 minutes, during which time the heater pushed out warm air with no error codes appearing. After switching off and unplugging – re-plugging to resume normal service, the stove was switched back on, and has performed faultlessly for the last two hours, (previously it was shutting down after 15mins and showing E6). Not only that, but the flashes of yellow flame (which the manual states as “normal”) have all but disappeared completely indicating a clean burn.

    PS: Roger advises that there may be an issue with the pump, possibly worn, which will give a drop in flame current (the right hand number in diagnostic mode) which the flame bar reads as a fault producing E6. Good to know.

    Result! And a big hat tip to Roger Banks at Dry-It-Out.

  54. paul says:

    Hello. I brought two zibro heaters, as a result of advise from here. They are really good. After two winters they are now giving error messages. I guess they need a service. E7 ( thermostat control? And E0 ( machine burning at a too low temperature?). Yes I have been using heating oil in them. Is the zibro similar in its maintenance to the corona.

  55. admin says:

    The error codes on the Zibro heaters are slightly different to the Corona models. According to the Zibro Kamin group manual that I have, the E0 and E7 codes represent the following (although there may be code variations from model to model)

    E0 – Temperature within the Heater too high

    E7 – Room Temperature above 32c

    I don’t for one minute think that the room temperature will really be above 32c or you would probably notice!. But it does indicate that there is some overheating going on inside the heater, or a faulty sensor.

    The Zibro heaters are designed a bit differently than the Corona or the SRE Series, but the cleaning principle is the same. I do have a workshop service manual which covers several Zibro models with a complete fault finding / repair procedure it may not list your exact heater model, but since they are similar in design and components it should still be a big help to stripping, cleaning, servicing and cleaning your heater.

    I’ve uploaded the full manual to a file hosting site, you can download it from the link below.

    Zibro Workshop Service Manual

  56. Catherina says:

    Hi there,
    I have a Zibro heater which has been working fine. I am now getting an E9 message which I understand as the heater thinking it has been knocked or moved, but it hasn’t. Any idea what else could be causing the problem?

  57. admin says:

    Hi Catherina

    Most error codes for Zibro Heaters are different to the ones for Corona Heaters, so assuming that you haven’t taken that code description from the actual user manual for the heater, then you should use the general Zibro Error Codes which are listed on This Page. You will also find a service manual which covers most Zibro Heaters and can be downloaded from the same page, this should help you to investigate further.

    According to the Zibro error codes, E9 translates to a clogged or dirty Fuel or Air Filter, so if you haven’t done so already, it may be worth checking and cleaning these filters first before moving on to other possibilities.

  58. Cristian says:


    I have a cuestion, witch voltaje work the oil pump?

    Thanks a lot

    Cristian R.

  59. Burl Solomons says:

    Thank you so much for this guide. I have just fixed my inverter 5006 after 2 years of it sitting unused. I actually nearly skipped it and bought a new one. It would appear that dirt in the fuel was the main cause of mine not working – there was a load of carbon and crud under the burner and of course this us where the fuel injector pipe leads in to, so the fuel mix was not able to reach the burner properly and the unit kept shutting down with E4 showing. Now lights instantly, no smoking or smells with ordinary bulk paraffin. Invested in a Mr Funnel to keep things cleaner in future.

  60. Anthony Weir says:

    Many users of the Inverter 3007 and 5007 report a CO2 fault: the heater will work for two minutes or even ten, then shut down with the CO2 error code showing. This seems to occur particularly often in Continental European models.
    It is very easily fixed.

    All you need is a Phillips screwdriver, a toothbrush and a paper clip.
    After disconnecting the heater:

    1. Remove the front panel (two screws on the side) with the screwdriver.

    2. Locate the transparent CO2 pipe curling up from the bottom right. Brush the white filter on the inside of this pipe with the toothbrush.

    3. Locate two little holes marked S1 on bottom right circuit board. Insert two ends of the paper clip (or part thereof) into these holes.

    4. Turn on the heater again and let it fire for about 10 seconds. Then shut it off and disconnect.

    5. Remove the paper clip, replace the front panel and turn the heater on. It should work perfectly, because the operation you carried out re-calibrated it.

  61. mahmio says:

    my problem with my corona heater is not erorrs.i just don’t no what should I do that my heater work for 24 our and dont be shut down every 3 over!
    thank you for your step by step guide.

  62. Ken Lowe says:


    I have two Ruby heaters.

    Both cut out after anything from 5-20 minutes.

    I hear 3 beeps, the ‘deodorise’ light comes on – and error code ‘Ed’ (capital E, small d) is displayed.

    I’ve even used a magnifying glass to check the error code – it’s definitely Ed.

    I can’t find this mentioned anywhere. It’s not in the manual, it’s no where on line.

    Any thoughts on what’s wrong with both heaters and how I can fix? At the moment, I’m constantly trying to turn them on & off!

    Please could you copy your reply to me by email – I can never find the threads / replies on my phone!

  63. James Bowler says:

    Anthony Weir, I would like to say a big “Thank You” people like you, restore my hope in humanity! taking time to help others, without reward !

    Best Regards James

  64. Ian pearson says:

    Hi 3 weeks ago I purchased a second hand inverter 5006. It appears to be a 2004 moddel but I could be wrong, the heater arrived and I did nothing with it just filled her up with heating oil filtered through a mr funnel. The heater has ran solid for the full 3 weeks until this morning, I came down the stairs to be met with no heat and a E4 error. I turned the heater off then back on and she failed to start on ignition and shut down with a E0 error.
    I followed the detailed strip down procedure and even had to make a new gasket. I also noticed the filter and tank were full of crud so cleaned the filter out and removed and wiped out the tank the best I could could.
    The heater is all back together now and I have run through ever option, she starts up and runs without fault.
    A big thank you

  65. Derek Reynolds says:

    Back again with a repeat of Februaries E6 failure.
    Last time the run through with the diagnostic mode cleared my E6 issue. Not so this time. All is clean and dust free, connections good, and though I have yet to discover the location of the ‘CO sniffer’, though the motherboard has a plug called “Air sensor” with the two blue wires leading off to the plastic coated sensor at the back of the unit, I have yet to remove the motherboard to investigate what lay behind. I can’t imagine a sniffer of sorts being buried behind it – but who knows.

    Next move will be to have the unit checked out by a specialist and a trip to Preston – unless another has an idea to follow?

    I have checked out Henk Peter, and Mister B’s posts, and my set up is different to Anthony Weir’s, no luck so far.

    Images on Photobucket:

  66. admin says:

    Hi Derek

    Reading back through your post from February, I believe that you were advised by a heater technician that your pump was failing an may need replacing. Has the E6 failure occured after the pump replacement? or haven’t you replaced it yet?.

    What is the flame rod current read out, when you repeat the diagnostic test this time? does it identify a drop, which could indicate that the fuel pump has perhaps worn to the point of requiring a replacement?.

    In relation to any parts that you need, there is a new company who profess to be able to supply new and used spares for Corona Heaters, so it may be worth shopping around for something as expensive as a fuel pump.

  67. Derek Reynolds says:

    I didn’t replace the pump, as after the initial diagnostic program run back in February, all seemed well, and it ran faultlessly whenever needed. This present failure is after a long Summer unused, and it has remained indoors in the same room in which it has previously been used in.

    The first diagnostic test two days ago showed a flame current reading that fluctuated rapidly between 17 and 49 for around 30 seconds, after which it steadied at 50 and remained there while the left hand reading went from 23 down to 6, where it remained at 6 – 50, during which time it blew steady warm air, and would still be blowing now if I hadn’t ended the sequence 20 minutes later.

    Then I shut off, unplugged, and delved inside again.

    The second diagnostic was done after I had looked more closely at the air sensor wiring to try and determine if there was a way of cutting it out of the equation. With no clear indication of a CO sensor to use the paperclip technique, I didn’t see how I could, so put all back together and ran the diagnostic again. This time the flame current read out started, and remained at 50 from switch on, all the way through the test with no fluctuation at all, ending up with the same read-outs of 6 – 50 blowing warm air continuously. My logic tells me that if the pump was on the way out, it wouldn’t be burning steady, if at all. But not being an electronics expert, or even partially knowledgeable in electronics – I could still be wrong on that score.

    The heater will run for a good ten to fifteen minutes on high heat from switch on, and then E6 will appear with the flame going out simultaneously while both fans continue to run until the unit cools sufficiently, when both fans then stop.

    What I have not done is take off the motherboard to see what lurks behind. Though my scepticism is inclined to think the whole caboodle needs trained eyes and hands on the thing. Preston and Blackburn are equidistant from me, and two hours away by road, so it looks like January before I can make that trip. A bit late today to phone them, but I will do so on Monday to sound them out – thanks for the link by the way.

    Electronics should be steadfast and reliable. Perhaps those sixty year old wick stoves have their place after all!! ;-)

  68. admin says:

    The “paperclip method”, refers to heaters which have a second PCB containing a dedicated CO2 sensor located just below the main PCB inside the heater, some models don’t have this additional PCB (my own Corona 3016 model included) and i’ve never got to the bottom of how it samples the CO2 content from the air, or whether it even does despite the feature being reference in the user manual. What it does have are two ‘bead’ type sensors located at different levels on the rear panel of the heater, one of these I’m assuming is the room temperature sensor (thermistor), no idea what the other one does, but it doesn’t look like any air quality / CO2 sensor i’ve ever seen, unless the Japanese have found some clever way of achieving it with this component. Without a schematic of the circuit board, or Bill of Materials, its going to be next to impossible to guess what this component does, and how it works as a CO2 sensor – if indeed that is what it is, overriding it without knowing what the circuitry behind it does, or confirming its demise without knowing what readings are expected from a healthy, working sensor is also just as impossible. Even the service agents of a lot of goods these days, tend to just replace circuit boards with new ones, rather than strip down and fault find existing PCB’s and repair them by replacing failed individual components!.

    Electronics these days should be steadfast and reliable but seldom are, I thought the same thing when I bought a new-ish car, and TV both in the upper price range and supposedly quality names yet both failed with Electrical problems shortly out of warranty, and neither can be repaired economically, and lets not forgot the exploding smart phones which are nearly always in the news!. In contrast, I have a Fidelity portable TV in the loft which I was given when I was nine years old, which still works just as good as the day it was bought, over 35 years later, and was only resigned because the original transmission system was switched off. Sadly products today are made to a budget, which is dictated to by accountants, not engineers. Sometimes I wonder if a products’ lifespan and longevity isn’t also, decided by the aforementioned accountants and then programmed in by the engineers.

    Back to the subject in hand, fortunately the majority of problems with these heaters, which would normally result in them being condemned can be resolved simply by servicing and cleaning, and replacing relatively cheap parts like the Flame Rods, as many have already reported success with. However, there will always be a percentage of failures in the field, caused by internal component failure and general wear and tear which cannot be resolved by servicing. When these occur, and without access to a service manual or schematic diagram its down to two choices. Either guesswork and a process of elimination by replacing parts ad-hoc, starting with the most likely first on a DIY basis or alternatively referring the heater to a service agent for a more professional diagnosis at a cost. In your case you have effectively already had what amounts to a diagnosis for the fault on your heater by an authorised service agent for Corona, which I would hope would come from professional experience, and access to service manuals, rather than the process of elimination which a DIY’er would use.

    Sadly, replacement fuel pumps are expensive, and once again it comes down to the throw away society which we live in, when some replacement parts, cost a large percentage of the cost of a new heater, despite being mass produced, probably for a few yen or dollars. You could possibly ask the vendor that if the pump doesn’t solve the problem (as they advised) whether they will take it back on a sale or return basis. I supplied the link to the other supplier, not because of where they were geographically but because they advertised that they sell used parts for these heaters, which should cost far less than a new pump.

    You mentioned that this heater was purchased back in 2003, I have no idea how much use it has had over the last thirteen years, but I suspect it is a candidate for a wear and tear failure by now :) and a fuel pump is a moving part, rather than being entirely electronic.

  69. Derek Reynolds says:

    I read you loud and clear – and agree with all.
    Will post more when success is achieved.

    There’s a chap on You Tube who tried the paperclip trick – and failed. But succeeded with bypassing the CO sensor as has previously been described connecting blue and grey wires (he had the arch type sensor). But mine’s like Admins – not visible in any recognisable form, so the pump looks the most likely candidate for replacement.

  70. Derek Reynolds says:

    PS: Planned obsolescence is the nature of todays beast. Built to a price that generates maximum profit and at minimum costs to ensure repeat sales.

  71. koos snel says:

    Good day to you
    I recently purchased a secondhand inverter 3003
    Is this the same as a corona so i can use the corona manual?
    recently i got some e codes and shutdowns like E0 E2andE4
    If it starts it is with a puf of smoke / mist if it is not starting alot of mist
    I use lamp oil as burning fuel i am in proces of buying a mr funnel
    Please advise
    Wkr koos snel

  72. Peter says:

    The model I refer to is inverter 5006
    Thank you

  73. Nikki Douthwaite says:

    Anthony Weir.

    A massive thank you, followed your steps and am back up and running with no CO2 fault. Thought this would be hours of endless stripping down and problem solving but best part of 10 mins and nice and easy. Once again Thankyou

  74. jon porter says:

    hi admin,
    strange probs with my inverter 5006,a couple of days ago while it was woking hard there was a click and the unit just shut down ,no error codes , just like someone pulled the plug, i noticed it was a bit hot on the top and left side carry handle area, about ten minutes later after cooling down the power came back and same happened,,so a service and clean out all fine but noticing a lot of yellow flames and spluttering ,once it settles down to minimum power its fine ,i cant sus it out ,main suspect to me is blower under rubber blast pipe or fuel pump, any idea anyone ,all components are squeaky clean. cant moan if i need a new one as its worked hard for seven years now
    ps, see zibro lc30 on e bay 205 pounds seems a bit cheap? thanks admin.

  75. jon porter says:

    I have just the piece on running a diagnostic .
    just tried it and the right hand figure is a steady 50 the left figure is 3.
    the guy says his figures are 6-50. any idea what the left figure is for.
    thanks , jon

  76. admin says:

    No idea. I can’t think of any normal fault which would kill the power instantly, usually the heater will shut down in a controlled manner and then display an error code. Have you checked the mains cable for a loose connection or broken wire?, tapped the circuit board for a dry joint, dodgy relay or broken track? (careful doing this when running as there is mains voltages on these boards). The only other thing I can think of, is that there is a overheat trip fitted to the heater, normally this is a thermal switch which looks something like this, generally they are only fitted to provide last ditch protection in the event of serious internal overheating and work by cutting off the mains power to the unit when a certain temperature is reached. It would be strange that this was operating before any normal overheat shutdown protection, but it would explain the click. If the unit is overheating, then since you have already cleaned the combustion chamber, its probably down to a blocked intake pipe or a worn or failing fan which isn’t running at full speed.

  77. jon porter says:

    thanks admin,

    there is what looks like a cut out under the burn chamber on a bracket.
    i soaked the injector pipe in carb cleaner for a couple hours so i think the blower is failing as you say..not to worry its paid for itself ten times over. all the best ,jon.

  78. Steve says:

    Hi, I bought a brand new corona 5006 to ship to Cyprus I didn’t have time to check it as I received it the day the shippers were collecting my stuff.

    Anyhow, it has never worked. It shows E9. I have sent several emails to the supplier but he hadn’t responded. I hadn’t wanted to open it myself as it should be covered by a warranty and I hoped there would be a service place in Cyprus, kerosene heaters being very popular for two months of the year.
    So, E9 is auto shut off, presumably in case you knock it over etc so I presume there’s a microswitch and a lever and it has been jiggled during shipping and stuck.

    Can you please advise me where to look for this cut off switch?

    Cheers, Steve.

  79. admin says:

    Hi Steve

    I think its far too sensitive to be a microswitch, in the conventional form. Looking at the Zibro Heater Service Manual, the tip over switch is mounted in the base of the heater, towards the back. There is every chance that the Corona heaters have them mounted in the same position.

  80. Mick says:

    Hi I cleaned my inverter as per the instructions in the video everything is lovely and clean, it worked perfectly for a day then e4 fault returned, so I took it apart again, it starts quickly and runs for 10 minutes then e4 it does make spluttering crackling noise while it’s running

  81. admin says:

    @ Mick, are you using Standard Heating Oil or the “Approved” Premium Paraffin recommended for the heaters?. If using domestic heating oil, are you filtering it for water and contaminants as it goes into the heater tank? – I recommend using one of the Mr Funnel style filters, which will not only remove dirt and debris from the fuel but will also remove all traces of water from within it too. Kero traps water readily, especially when stored in underground metal tanks over the winter months, and the spluttering and crackling noise could be indicative of water contamination, which these heaters are very sensitive too. Even if it doesn’t solve the immediate problem, its good practice to filter the fuel routinely.

    I would try the above first, before looking at other solutions which may require replacing parts within the heater.

  82. Mick says:

    Hi thanks for replying, the fuel I’m using is kerosene for the central heating, I’ve been using a Mr funnel for some time but have replaced with a new one and I’m also now using dipetane, the fire works fine for a while then starts to splutter it also smells of fumes I turn it off for 10 minutes, and then restart and it’s fine again for a few hours, it’s got me baffled

  83. Paul says:

    Hello. I’m trying to disassemble the burner on a zibro LS32. So I can clean it up.It’s very different to the corona. Anyone done this? I’m not sure how to do it, and don’t want to force anything. Thanks

  84. marcus says:

    hi serviced inverter htr as shown above and all was well but now soon as it reaches temperature it goes e4 agai ,if I raise temp to 30 it will run all day could this be a faulty flame rod ?

  85. Paul Huntington says:

    Hi my scot, rolf inverter heater was working fine then started coming up with an e5 error, I’ve done a service but still just an e5 error, any help would be grateful.

  86. jk says:

    power going to heater but display switches won’t work just showing —- is it possible something not connected inside and if so what is the solution

  87. Rabia says:

    Hi hope you doing well! My heater showing error normally turns on with display then after some seconds it doesn’t blow up like before. After that showing Error1. Kindly help me to resolve this problem.
    Thank you

  88. michael says:

    I have x2 heaters, neither more than 2 years old. I am using central heating oil adding 5ml of Diapthane per refill. with no forewarnings, Both have stopped working!!!
    x1 gives E9 code and the other E2-E6-E9 codes. Both are powering and there feels a warm air, however, usually less than 1 minute the errors stop the continuing. I have drained the onboard tank, except for some pure paraffin and diapthane, left overnight but no difference. I have a new filter between the tank and refill tank. I’m at a FROZEN standstill. PLEASE ANY HELP

  89. admin says:

    Michael, you don’t mention the make and model of the heaters, but as you have commented on the Corona servicing page, i’ll assume that the error codes are both on a Corona brand of heater, and since all of their models share the same error codes I can address them both on the same reply.

    E9 is triggering of the movement sensor, this is the sensor built into the heater which senses it being knocked or tipped over, usually this triggers when somebody knocks the heater, but it can be down to vibrations from nearby appliances or being placed on an uneven surface.

    This sensor, being a safety device can be sensitive, So make sure that the heater is on a level surface, with no nearby vibrations, also try it in a different location to see if the fault clears. This fault isn’t caused by anything to do with the combustion process, or fuel quality, it is purely related to the built in shock sensor.

    Among the three faults you have listed on the second heater, E6 is unfortunately an internal non serviceable Electronic Fault, usually related to a component failure such as the fan, igniter, Electric pre-heat Element or even a component on the control PCB itself. I assume that you have already tried cleaning the combustion chamber, and especially the flame rod as per the guide above?, as this may be something to try before you take it to a service agent.

    If any of the E5, E6 or E7 numbers appear in these comments, I generally refer the Author to taking the heater to a service agent for repairs – as these codes are all listed by the Manufacturer as being triggered by an internal component failure. But there is no harm in trying to cleaning procedure above, and checking for obvious things when the heater starts, such as the fans starting correctly and reaching their normal speed

    Did anything happen around the time that these heaters went faulty? – e.g Thunderstorm, Power Failure, Running from a Generator or the power being turned off whilst the heaters were running?.

    Are these heaters used in the same room, or different rooms?. It might be worth trying them in a different location – i.e Different Room, Shed, Garage etc to see if this affects or changes the errors in any way.

  90. michael says:

    My Sincere Grateful THANKS for your response. Sorry, x1 Heater is Zibro and x1 Toyotomi heater Both 3kw. Both are in different rooms within my home. As far as I’m aware, there were no instances of power cuts, etc. Both are surge protected. from mains 240v In the past, I’ve had E6 codes and found by cleaning or replacing in-tank filter fixed such. Not this time. As far I’m aware, there is only 1 Agent/repair in my vicinity, FY8 3EL. I’m informed by a friend a previous customer of the agent/shop unless the heater and paraffin were purchased from the shop, and replacement paraffin purchased, then they do not provide assistance. Further, if central heating oil has/is the fuel used? Then again No assistance provided. Both my fires have only ever used domestic heating oil. I have considered buying replacements, however sourcing is one matter, but the prices are extortionate, i’ve seen one @£250 aand another @£399.Crazy prices. From the time and patience i’ve put in trying to find a fair price. one could almost believe that the range for sale is purposefully being cut back? Yes tried cleaning the combustion chamber and flame rod which didn’t have much deposits. Checked the fittings for being loose etc. one thing I did not see is the oil filter as mentioned to carefully removee and gently clean – mentioned on youtube uk. i’ve checked till i’m crosseyed to no avail. I MISS the heaters GREATLY. I’M DISABLED AND HAV RAYNARDS TOO. ANY ASSISTANCE GATEFULLY APPRECIATED. MANY THANKS

  91. admin says:

    Hi Michael

    As you have found, these heaters do lack useful technical information and service support in the UK, however service documentation is a little bit more widely available in Europe, where the use of these heaters is far more widespread – the problem is, any information or documentation which is available, is generally not written in English, as its intended for European service agents rather than the general consumers.

    I’m not sure how useful this Zibro service manual will be to you, but its in English, and its possibly more information than you have seen already, and towards the end it gives an “E” code error list, with a flow chart explaining the cause and possible solutions – the E code diagnostics start on Page 73 of the manual below, if you don’t want to read through the entire thing.

    From what I can see E9 potentially leads to a Fuel Pump issue – assuming the E9 is on the Zibro heater. Although there are several other things to check as the flow chart for this fault code is quite comprehensive as it surrounds combustion issues. It might be worth just going through the ‘E’ codes in the manual, and try each solution as far as you can.

    Although the fact that you don’t seem to have a mesh fuel filter on your heater is a bit of a concern – these fit directly inside the fuel filler opening directly under the removable metal fuel tank – the bit which the metal fuel tank fits into. Often these fuel filters also have some kind of a post sticking up out of the centre, which pushes the spring release on the metal tank cap, in order to release the flow of fuel into the tank in the base of the heater, so it would be unusual for it to be missing. This plastic mesh filter traps debris and dirt from the fuel and it is quite surprising how much it catches (I clean mine about every 5 tank fills). If it is missing, then this would allow those nasties to flow through the pump and into the combustion chamber, although the pump would likely be the first casualty.

    I think faulty CO2 sensors can also be a cause of many problem on Zibro heaters, and replacements can be found online – usually in Europe.

    I do think it shortsighted of the Service Agent not to open their doors to repairs and servicing for all heaters just on principle – especially given the time of year, after all a mechanic won’t refuse to repair a car if it has been run on Supermarket Fuel instead of Shell Ultimate!. But I have heard and have read about this before.

    Obviously they are free to run their business however they choose and I can understand their stance from a warranty prospective as running on anything but expensive approved premium fuel (which defeats the point in using them for many people), will void any warranty, but i’ve got no idea why they would refuse to repair or service products which are out of warranty, or refuse to supply spares to those who want to service the heaters themselves. I imagine it could be quite profitable, provided of course that they ensure that any replacement parts will have their Warranty voided once the customer runs on heating oil – but I think most people realise this, at least the ones who seem to comment here.

    Given virtually every visitor who has left a comment here over the last ten years has been using Heating oil at some point, if not continually, so I suspect the service agent is cutting themselves off from quite a lucrative after-sales market in repairs, parts and servicing – but if they can afford to do that at this moment in time when most businesses are struggling, then its an enviable position to be in!.

    Fortunately, our European neighbours have a more relaxed stance, and on the continent spares for pretty much all heaters are widely available, even down to sensors, circuit boards and replacement pumps. But you do have to factor in the cost of some of the replacement parts over the age / condition of the heater, and a brand new one, but some repairs can be economically viable based on parts cost.

    I know that this company have supplied UK customers with spares in the past, although I don’t know if this has changed recently in relation to Brexit, but they will probably still be happy to help with the supply of any parts which you need.

    The link above takes you to the page for Zibro heater parts, in case you decide to fault find and eventually try a repair to the heater yourself and need to obtain replacement parts. They have a reputation for being helpful, so its worth an email to them to double check any parts are the correct ones, before buying, if you give them the heater model number and what you need they may be able to obtain it for you.

    Obviously, how far any reader takes repairs and servicing of their own heater comes down to a combination of each individuals DIY skills and knowledge, but all of the information to at least point you in the right direction, for the Zibro at least, should be contained at some level in the manual above.

    The prices of these Heaters in the UK are expensive, certainly when you consider you can buy generic branded ones in Italy for around £140 / £150. There was an Italian company called Brico Bravo whose Ebay store I used to link to every Autumn, but they stopped shipping outside of Italy about 12 months ago, citing problems with heaters being damaged in transit. Which was a shame, as they were routinely £100+ plus cheaper than in the UK, and I still have a ‘Kero’ brand heater purchased from them in 2011 which has never given any problems.

    If you do decide to replace, I have however, been able to find this Company in Spain offering this heater, who appear to ship to the UK for about £18. This would put the price of the heater at just under £200 delivered to you.

    Could you perhaps leave a comment to identify the codes which apply to the Tayo heater?, this may be a bit more difficult as these are often Japanese / Chinese generics, but i’ll give it a go.

  92. Mark Atkinson says:

    Hoping you can help.
    We’ve 2 if the Corona 5096 inverters. After doing a full service on them one is 100% perfect and as good as new. However the other just won’t fire up and giving E0 error. I’ve completely changed the fuel in canister and tank but still getting E0. It did fire up after 6 attempts but now doing same again. I know the fuel is ok as it did fire up but after shutting it down it won’t restart again.
    It’s got me totally baffled.
    Any advice would be gratefully received.
    Regards Mark.

  93. Mark Atkinson says:

    Update to my question.
    I finally got it running by repeatedly trying to start it, it seems touch wood to be running ok now but I’m asking if by servicing them it can lead to initial start up issues until its bedded back in say. I cleaned the flame se sensor and igniter but they have seen better days.
    I’ve had this before on another heater stood for a long time it did run eventually but took what seemed ages to get it to ford up.
    I’m curious if they get used to running poorly and once cleaned it upsets the balance.
    Trying to find spares in the UK is a nightmare as ideally I’d change out these parts if in doubt.
    I’ve pics of the sensors but how do I upload them it may help you diagnose an issue.

  94. admin says:

    Hi Mark, I don’t think there is enough programmable intelligence inside these heaters to adapt to changing / aging components. Most faults are caused by the delicate balance fed back from the Flame Rod, and the circuitry inside these is so sensitive that even a small change in parameters can cause the heater to trip into a fail safe mode, or just not start at all, and carbon build up and wear is more than enough to change the resistance of the rod to beyond its expected values.

    Wire wool is by far the best method of cleaning the flame rod, but if the resistance has been changed by wear and tear its generally time to replace it.

    There is a method of adding a small circuit between the flame rod and the circuit board, which restores the parameters without compromising the safety aspect, and it was covered on Youtube. I will see if I can find the channel.

    Spares aren’t easy to come by in the UK, especially if you have been running on Heating Oil, you are likely to get barked at, then read the riot act on Warranty etc. The rest of Europe are a bit more tolerant, and are generally happy to sell spares – at least prior to Brexit.

    If you do decide to replace the phrase is “Contrôleur de flamme pour les poêles a pétrole CORONA

    I’ve found to be useful for listing spares.

  95. Mark says:

    Thanks for that I have found a supplier in the UK nearby me.
    Filters £10.
    Flame sensor and igniter £9 each.
    But I’m now experiencing a new problem, a nasty smell when running, fuel seems clean but filter dies go dark after 3-4 days. I cant get my head around this new problem.
    Is it Fuel or something more sinister.
    Any ideas would help. To add it’s only recently started doing this but we are running it more due to extremely cold temps.

  96. Jimmy Dewhurst says:

    Hi everyone just an update for those with heaters who live in the North West

    Please note that I have no connection with this company, but I can personally recommend the service which they offer because I have used him myself,
    Contact number for the Northwest Engineer is below should you decide to follow that route.
    Alex – 07988774336
    Inverter Zibro Corona service centre
    33A Bonds Lane Banks PR9 8HG

  97. Mark Atkinson says:

    Firstly thanks for reply to previous question was very helpful.
    My next issue is more complicated I fear.
    After servicing the heater its run absolutely find until now. For some reason it doesn’t seem to be getting as hot as it did, the air coming out isn’t as hot as it was and it struggles to hit temps over 16 degrees. Before you couldn’t keep your hand in front of it as it was very hot now you can, the fuel is spot on so could it be a burning issue or flame sensor issue or totally separate matter.
    We’ve 2 heaters and the second gets much hotter and faster.
    Any ideas would be gratefully received.
    Regards Mark.

  98. admin says:

    Hi Mark

    I don’t think the flame rod will have any bearing on the heat output, its purpose is purely to detect the presence of the flame, and cut off the heater and fuel pump to stop the fuel flow if the flame fails in order to stop hot heating oil from leaking everywhere. Its more likely to be a combustion issue, are all of the fans running at a good speed and not blocked. It may also be worth checking the small needle injector nozzle which squirts fuel into the combustion chamber in case its partially blocked. What colour is the flame, once the heater starts?.

  99. admin says:


    I’m a bit confused as to which comment was the one that you wanted to be active, as on your other comment you mention that the fuel was fine and you didn’t think it was the cause of your heat output issues, but yes, if there is a problem with the fuel then yes it will affect the heat output!. There is a fungus called Diesel Bug which can grow in fuel storage tanks, usually as the name suggests it targets diesel, but it can affect heating oil as well. These spores can cause havoc with fuel systems and can cause darkening on filters, so its a possibility. Obviously I wouldn’t recommend still running the heater on this fuel with this possibility as it can cause serious issues with the components. The first thing I would try, is to run the heater on a tank of premium paraffin – the pre-packed 4 litre containers available from B&Q and hardware shops. If the heater runs fine on this, then it points to being the fuel which is the issue.

  100. Mark Atkinson says:

    Flame seems blue with flickering of yellow simalar to what you see on a gas hob. I’ve since found out the pump itself can gum up causing issues supplying the required amount.
    Do you have a article on stripping these down with pics, I’ve been told how to it but theres numerous small springs and washers in the assembly. Very tiny so easily lost.
    The local service centre was very helpful in this advice on stripping them down and to be honest I thought they were sealed units but it makes sense if the tank is cleaned out, burner assembly done that if the pump is gummed up a vital part in the chain is missed out.
    I know there’s 2 tiny countersunk screws once the pump is out then the internal assembly is accessible.
    They also stated they recoat the burn chamber with high temp spray to reduce the chance of deposits sticking.
    Regards Mark.

  101. admin says:

    Hi Mark

    Stripping the fuel pump is something i’ve never needed to do, and its not something that I can recall anybody else in the comments doing. All I can suggest is that when you take apart the pump that you photograph each stage so that you can recall where everything goes when it comes to re-assembly, obviously its not always possible to this, if several parts all go in different directions as soon as the case is opened!.

    These kind of pumps are called facet pumps, if you want to do a search, but I couldn’t find anything useful on stripping these pumps down from a quick Google or Youtube search.

    My own inverter heater is running at the moment, and its also a blue flame, with occasional flecks of yellow. So at least on that score, there doesn’t seem to be anything out of place.

  102. Mark says:

    Many thanks for all that, I think I’ve narrowed it down to a bad batch of fuel, amazingly enough premium parraffin from local garage. Filter kept going brown and advice I had was poor fuel or even parrafin with Bio fuel in it which attracts moisture.
    I’ve also re coated the burn chamber with high temp 800c paint as advised as it helps reduce carbon build up on the actual assembly instead it sits on the coating which can be removed more easily if needed next time.
    My pump was ok I just cleaned the brass parts in acetone.
    I enjoy fixing these and each aspect is different but ultimately now I’ll be doing this on each component ie, burner assembly, both fan units, sensors, tank and pump that way nothing is missed in the chain.
    Maybe my experience and so far positive results can help others as well.

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