Truma Boiler Advice

[Broadway]

Good afternoon, I am trying to remove the rear panel on my Truma boiler to replace the 240v fuse that has blown. This following notification on the inet app and of course not working on electric hook up. I have removed the sliding top piece and removed the two torx screws to loosen the panel covering the pcb. The panel is loose but the base of the panel seems tightly jammed in place.

Any advice of how to release the panel much appreciated as I think there is just enough room to reach the fuse with the panel removed and so avoid removing the whole unit.

Many thanks in advance.

 

[irnbru]

Have you tried resetting the trip switch?

 

[dunnah01]

The 240v fuse is on the lower panel so is even more awkward to get at. I may have got lucky but once the upper screws had been removed the whole inner cover came off without any other screws (can't recall if anybody had been there before and simply not replaced a couple of lower screws tbh) - sorry not much help really

 

[Broadway]

Thanks irnbrew, yes I reset the the trip switch and it’s fine and all working on gas. The error code was the 240v fuse.
Thanks dunnah01, that’s what I expected but it’s resolutely stuck. It sounds like I’ll just have to keep trying.

 

[Broadway]

I finally removed the cover after 2 hours of twisting and waggling!! For anyone else trying this, I can confirm there are no addition screws on the bottom of the cover just a very tight plastic to plastic fit. Fortunately there is just enough access to change the fuse. Thanks for the replies and I hope this helps someone in the future

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[Broadway]

Good morning, I replaced the 10a 240v fuse but still getting the same error code.
The error reads “combi 4e, sorry there is a warning 407H: no 230v operating voltage: 230v fuse defective”
All working fine on gas but on electric just a couple of clicking sounds and the the error code re appears.
Any advice greatly received. Thanks.

 

[GeoffnDee]

Have you checked to confirm that 240v is getting as far as the combi input side ? (The controls are 12v)

 

[dunnah01]

The 240v elements are a weak point and I had to replace both of mine recently. I don't have the Inet system so not sure what the error code means but it sounds a bit like the 240v elements have had it

 

[doug harding]

don't forget the bottom fuse is " slow blow ". we had to use a mirror to help locate this.

 

[Broadway]

Hi thanks all. 240 input ok, Truma slow blow fuse fitted, reset tried several times. Looks like a trip to the dealers. The whole boiler was replaced only 18 months ago due to element failure and I think it came with a 3 year warranty. Thanks Al for the suggestions.

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[Broadway]

This is confusing, from two Truma manuals one says fuse must be T10A H (slow interrupting) the other says F10AH ( quick acting) the one I removed is F and the continuity is fine so I’ve put it back as the ones as bought were T in accordance with the manual I had. I’ll contact Truma but wondered if anyone else had come across this. Photo attached

 

[Broadway]

I had a very quick and comprehensive response from Truma as below for reference. What is interesting is that the boiler now installed in the van requires the quick acting (F) 230v fuse not the slow acting (T) one.

“Thank you for your enquiry. Fault code 407 indicates that there is a lack of 230v power to the unit. We would advise that you contact your dealer for them to check that 230v is getting to the orange lead of the combi, then check that voltage is going through the 10a fuse on the 230v pcb. They should then check at the reset switch and check the pins and cable on the ribbon connector between the 12v and 230v pcb.
If all this seems ok, then it may be that the pcb needs replacing.
As regards the fuses, your Combi boiler does require the fast triggering fuse part nr 39050-00381”.

 

[GeoffnDee]

It seems that the 2018 onwards combi uses the different fuse ,part No 39050-00381 , the fuse pre-2018 is part No 34020-00073.

 

[Bradders65]

Have you phoned Truma near Derby. I have found them very helpful. Don’t forget you need to clear the fault triangle on the control panel.

 

[leatho]

Truma Limited
2000 Park Lane
Dove Valley Park
South Derbyshire
DE65 5BG
Main: 01283 587960
DDI: 01283 587962

www.trumauk.com www.powrwheel.com
They are very helpful

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[Broadway]

Thanks, yes I’ve spoken with Truma and they were very helpful. The info above was also from them following an email where they also confirmed the fuse change on later models.

 

[Lesanda]

I had a very quick and comprehensive response from Truma as below for reference. What is interesting is that the boiler now installed in the van requires the quick acting (F) 230v fuse not the slow acting (T) one.

“Thank you for your enquiry. Fault code 407 indicates that there is a lack of 230v power to the unit. We would advise that you contact your dealer for them to check that 230v is getting to the orange lead of the combi, then check that voltage is going through the 10a fuse on the 230v pcb. They should then check at the reset switch and check the pins and cable on the ribbon connector between the 12v and 230v pcb.
If all this seems ok, then it may be that the pcb needs replacing.
As regards the fuses, your Combi boiler does require the fast triggering fuse part nr 39050-00381”.

I had the same problem with mine and found that by unplugging all the miniature plugs, cleaning and reconnecting, the fault code vanished. However I still have one element duff which I'll replace at some time (if I don't forget).

 

[huck999]

Anyone know why these boilers always seem to be fitted so that you need mirrors and five arms just to change a fuse? Mine is in the middle of the van, under the bed, and from what I can see, it could just as easily have been fitted 180° around and the exhaust taken to the other side of the van. But no - lets put the controls at the back as inaccessible as possible...!

 

[Rozzer]

The only thing I dislike on our Adria is the Truma system. Error codes most trips. Must be something radically wrong when you design a heating system which has 2 pages of fault codes in the manual. Not had an error code on our home boiler for ten years..