Truma Combi Error Codes

Discussion in 'Heating and Air-Conditioning' started by maison, Mar 6, 2016.

  1. maison

    maison Funster

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    while away this weekend our Truma Combi shut down with the panel showing E202H as an error code. Needless to say, this particular code is not shown in the handbook!

    Checking on the internet did not provide an answer but similar symptoms suggested an automatic shutdown due to overheating. This is borne out by the fact that the system could be reset after about five minutes, presumably a cooling down period.

    The system was running high, being a near freezing morning, so was heating the van and the hot water after having showered. Running on gas it does produce a lot of heat.

    After the restart it has operated OK.

    Does anyone have experience of this, or the error code? I have e-mailed Truma and await a reply.

    If I get a resolution via Truma I will post their answer, for information.
     
  2. Theonlysue

    Theonlysue Funster Life Member

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    Is there an air gap that you've covered over?
    Might need new fan if running hot?
     
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  3. maz

    maz Funster

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  4. maison

    maison Funster

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    @maz
    The manual you kindly uploaded shows error code 202 as "switch for gas shut off valve open".

    What the hell is that?

    Never heard of it.(n)

    If it means the safety cut off, in case of accident, that could not be the case as it had been running OK for over an hour.
     
  5. Stroppy Bird

    Stroppy Bird Funster

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    @maison that's how I originally read it too.

    However, having had a second look at the manual I think that what it means is that any 4 of those codes in that section can mean any of the three faults to the right along with their corresponding fixes. Otherwise the line under each fault would go all the way over to the left under the number as well.

    Does that make sense?

    Which would mean that I think that maz is right and from your description sounds like the overheating protection has kicked in.
     
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  6. maison

    maison Funster

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    @Theonlysue
    Thanks for the response.

    Nothing covered up. The m/h has just had its annual habitation check where I asked them specifically to check inlet and outlet air flows to the Combi because of an earlier problem.

    The M/h is one year old so I certainly hope the fan is not knackered already.:confused:
     
  7. maz

    maz Funster

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    Think it might mean a remote switch that operates the gas valve? Your Combi is a later model than mine and I have no such new-fangled gadget on the system. o_O

    As I read it, code 202 can refer to any of the 3 listed fault options - the overheating one seems most likely in your case.
     
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  8. maison

    maison Funster

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    @Stroppy Bird
    Thanks.

    I think you could be right.

    If Truma deign to reply I will post here.
     
  9. maison

    maison Funster

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    As promised, a reply from Combi.

    Fault code 202 normally indicates to us an issue with the gas supply to the heater, you need your local dealer to check the gas standing and working pressures to the heater.

    If you require any further assistance do not hesitate to contact us.


    I have passed the info to my local dealer and I will post the outcome. It is unlikely that I will be able to have the work done until after Easter as we need the m/h then. The dealer has stated that if it turns out to be a problem within the Combi unit itself it will have to be returned to Combi themselves. We cannot take the chance that it will not be returned in time.
    So, we take the chance that the fault will not return and stay, over The Easter trip.:(
     
  10. Gellyneck

    Gellyneck Funster Life Member

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    Real outside possibility. You're not using butane are you and it's not gassing off sufficiently due to cold weather? Probably not but ..................:unsure:
     
  11. maison

    maison Funster

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    No. Definitely on Propane as we use the m/h a lot in the Winter.

    Despite the answer from Combi my money is still on a faulty heat sensor allowing the unit to overheat and then the safety cutout operates.

    Watch this space for the next thrilling (?) episode.;)
     
  12. Gellyneck

    Gellyneck Funster Life Member

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    Yea, guessed it wouldn't be butane but worth the question.
    We await with bated breath the final outcome.
     
  13. maison

    maison Funster

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    @Gellyneck
    I have sent Combi some additional info so, if it changes anything material, I will post their response.
     
  14. jezport

    jezport Funster

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    have you got all the blown air outlets set to open? as reduced flow can cause issues.
     
  15. maison

    maison Funster

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    Thank you, yes.

    That was checked and the heater cowl was removed to check that both inlet and exhaust flues were unobstructed.

    Prior to the E202H failure on Saturday the heater had been running for over an hour. As it was a very cold morning, and we were also running the water heater, there was a lot of heat being generated. I still suspect overheating caused by a faulty sensor, but I am no expert.(n)

    As the unit is within warranty and we will be going on an extended tour in May we want it fixed properly. Unfortunately, like any intermittent fault it will be hard to track down.
     
  16. jezport

    jezport Funster

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    Did you track down the issue?
     
  17. maison

    maison Funster

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    @jezport
    Yes.

    None of the above.

    The "Crash shut off valve", or whatever it is called officially, was faulty and kept shutting itself off. No gas to the Truma triggered the fault code. Apparently that was the nearest available code to the actual fault.

    If you see Truma's reply, in my post of March 7th, they were technically correct. " fault with gas supply". I.e. There was no gas supply!
     
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