Fault 5secs from ignition - Trumatic C3400 - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #1 of 6 (permalink) Old 29-10-2019, 13:17 Thread Starter
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Fault 5secs from ignition - Trumatic C3400

Hi Everyone

Please can you assist. After a completely pathetic and unhelpful response from Truma UK and I am now looking for some advice on repairing or figuring out what may be the problem with my C3400 unit.

The unit fires up fine and I can hear the gas ignite and working and I can feel heat coming from a vent nearest the unit but the unit then shuts down with an red LED error after about 5 seconds from the ignition of the gas. I am running the unit without water in the boiler (which the manual mentions is fine to do as I do not have an EL version) and all the vents are open and unobstructed.

When I spoke to Truma, the lady simply said ah no you have an old unit, parts are unavailable and you must replace the boiler. The attitude and un-helpfulness was astonishing. I am due to speak to Truma Germany as my motorhome is a Knaus unit but hopping someone on here could perhaps help.

I believe it may be the Gas valve / regulator on the unit? Is there a DIY fix? Or will I need a new component?

Much appreciate any help I can get as I am freezing atm whilst my heating is broken!

Cheers
SAFFA MARK
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post #2 of 6 (permalink) Old 29-10-2019, 14:23
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I remember reading a similar problem (tho can't remember where!) and think a suggestion was to wire the boiler directly to the batteries?

As everyone on here knows, my knowledge of electrics is almost non-existent but hopefully this will bring them in with a solution!

Jean
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post #3 of 6 (permalink) Old 29-10-2019, 17:20
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I can only speak from my experience with a similar problem which was due to the bulkhead regulator which would not allow an adequate gas flow to keep the heater going when it was calling for full demand. I did find that if I turned the room stat control to minimum the heater would keep going and I could increase it little by little.
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post #4 of 6 (permalink) Old 29-10-2019, 19:32
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Get the manual and trouble shooting guide here :



https://dealernew.truma.com/_anweisu...atic_c_gb.html


A steady red led indicates insufficient gas pressure (faulty regulator ?)



Are you using butane (blue cylinder) which loses pressure when cold or propane (red cylinder) which is best in cold weather



Alan
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post #5 of 6 (permalink) Old 29-10-2019, 22:34
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That sounds like a very helpful post Alan - and your 1st after nearly 8yrs?! A big welcome!

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post #6 of 6 (permalink) Old 30-10-2019, 14:23
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There are so many faults to make them red light fail, the two most common are low volts across the heater, and also low gas pressure, debris in the exhaust can also cause red light failure.


Truma are usually more helpful, but cannot be expected to keep parts forever.
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