Help please! Truma 6E Error W255 H Can’t find Reset Button (1 Viewer)

[therealvicz]

I have a problem in my Truma 6E heater in my 2019 Chausson 727 GA. Arrived on campsite today, turned heating on, no heat or hot water but code W255 H . Tried to reset on the panel but now it wont reconnect to the boiler. I have read here about resetting the microswitch but there doesn’t seem to be one on this model (It is the diesel version not gas) or am I missing something? or alternatively something to disconnect reconnect? Unfortunately access is very difficult attached a couple of pics . Thanks IA

 

[Peavy]

Check for 12V in the heater

 

[GeoffnDee]

W255H = No 12v supply to the boiler or problem with the data cable between the heater and control panel , is the 12v fuse on the heater ok and , as suggested , check if there is 12v supply at the heater and if not there may be a 12v fuse on the habitation PSU for the heater (the control should have its own 12v supply)

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[LithiumConvert]

On our motorhome, there is a fused output on the Schaudt EBL 30.

If yours uses the Schaudt EBL check the fuse labelled Heizung

 

[therealvicz]

Thanks for your quick replies. I have already checked the main motorhome hab fuses. Tomorrow I’ll check the fuses on the unit & let you know. Meanwhile we chickened out at 2 degrees and went home.

 

[Russell's Dad]

If your 6e is the same as mine then the reset button is on the PCB, as shown in this photo.

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[Lenny HB]

If your 6e is the same as mine then the reset button is on the PCB, as shown in this photo.



View attachment 854900

Different heater yours is gas OP's is diesel.

 

[Lenny HB]

Often the supply fuse is seperate to the 12v distribution unit so the heater has a perminant 12v feed that's how Hymer do it so worth following the wiring back.

 

[Russell's Dad]

Different heater yours is gas OP's is diesel.

I should've read the post properly. Was trying to multi-task. Doomed to failure as usual!

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[therealvicz]

I should've read the post properly. Was trying to multi-task. Doomed to failure as usual!

Thanks anyway, appreciate the effort.

 

[therealvicz]

Just a quick update, checked both fuses in the unit and they are OK. Disconnected the hab battery, waited a bit, reconnected and still the warning triangle and W255 message came back straight away. Time call in a pro I guess.

 

[Vanman]

Might be worth tracking it back first with a multi-meter to see where the 12v runs out ...

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[Lenny HB]

Might be worth tracking it back first with a multi-meter to see where the 12v runs out ...

Yes as the controller is often fed from a separate 12v source, just because the controller has power it doesn't mean the boiler has.

 

[therealvicz]

Might be worth tracking it back first with a multi-meter to see where the 12v runs out ...

Yes definitely agree but I’m too old and fat to do that myself is the frustration of it

 

[therealvicz]

Thanks for all your replies to date. My local dealer found that there was no power on the 12v, because the van fuse had blown, despite me having replaced it and it seeming to be Ok, in fact what is happening is that as soon as you can make the control panel connect to the boiler the fuse blows. After some passing from pillar to post Truma technical support reckon it’s either a PCB fault, a glow plug fault, or a diesel pump fault. I’ve booked it in to their Derby workshop but can’t get in before Feb 21st. In the meantime I’m hoping for some inspiration or maybe trying to find someone nearer Telford who might be able to help me take this forward.

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[TG1903]

Just found your post I had this fault and it was the 12v ground cable to heater in the plug inside the CBE fuse unit that wasn’t making good contact , worth jiggling it about to see if it comes on ,Also worth checking the Live plug to the heater also inside CBE fuse unit

 

[therealvicz]

Just found your post I had this fault and it was the 12v ground cable to heater in the plug inside the CBE fuse unit that wasn’t making good contact , worth jiggling it about to see if it comes on ,Also worth checking the Live plug to the heater also inside CBE fuse unit

Interesting, I didn’t look under the cover of the fusebox. The vans in storage atm but I’ll have a look when we fetch it back prior to taking it to Truma on 21st . Thanks.

 

[therealvicz]

An update following our day at Truma. They put the boiler on a bench and ran diagnostic tests which found no faults. They re-installed it, fitted a new fuse, filled some water, and it worked perfectly on all modes and fuel types! After testing it for several hours it continues to work perfectly. So, good news up to a point I suppose. Maybe a PCB glitch that got reset, or a wiring fault or loose connection that got fixed, who knows. Truma charged me a reasonable one hours labour, £80 or so inc vat, and left me contact details in case what apparently went away by itself decides to come back by itself, but for now, apparently fixed…

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