Truma C3402 boiler 240volts element

[Manic]

Hi, this morning the Truma C3402 boiler in my 2001 Hymer B584 has stopped working on 240 volt.
I suspect it’s probadly the 240 volt element, has anybody had to replace one and what’s involved, can it be done with boiler in position.
cheers

 

[Lenny HB]

Am I right in thinking the boiler is in the bottom of the wardrobe? If so I think it will be a boiler out job if so probably not worth the bother.
Cheaper to run on gas anyway, I've never had a van with electric heating so probably a bit biased.

 

[Odd-no-more]

It's down to access, the element is not hard to replace as long as you can get to it. Not cheap though, I think about £140

 

[Manic]

Am I right in thinking the boiler is in the bottom of the wardrobe? If so I think it will be a boiler out job if so probably not worth the bother.
Cheaper to run on gas anyway, I've never had a van with electric heating so probably a bit biased.

Yes it is in the bottom of the wardrobe.
I’ve failed to find any info on where the element is.

 

[68c]

My truma 240v element failed as well. I then found the boiler frost protection valve had opened dumping the water. I am not certain but wonder if the element is normally immersed in water, heating it dry causing it to overheat and fail. In my case the valve had opened when i disconnected the leisure battery, I did not know this would trip the frost valve so did not reset it and refill the heater tank.

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[Lenny HB]

This is about replacing the gas burner but there are some good pics of the stripped down boiler.

Truma Trumatic C3402 boiler inspection and troubleshooting – Motor-Roam

motor-roam.co.uk

 

[two]

I think yours is a 'conventional' immersion heater which is easy to replace. Newer models have the element embedded in fins around the outside and can be difficult to remove.
Your challenge will be to find it, though. The boilers are installed with minimum space being the consideration rather than accessibility. You may need to pull the whole thing out.
Unless you spend your time on sites where 'leccy is an inclusive charge, it's probably not worth bothering. Gas is cheaper than 'leccy for the same amount of heat (considerably so if you use refillable) and the cost of a new element can buy an awful lot of gas.

 

[Wagoneer]

Is it the type that just heats the water up ?

I retrofited a 240v heating jacket to my 2002 Hymer with the boiler insitu. The boiler was situated beneath the wardrobe so only needed the shelf above the boiler removing to gain access.

 

[Manic]

My truma 240v element failed as well. I then found the boiler frost protection valve had opened dumping the water. I am not certain but wonder if the element is normally immersed in water, heating it dry causing it to overheat and fail. In my case the valve had opened when i disconnected the leisure battery, I did not know this would trip the frost valve so did not reset it and refill the heater tank.

Thanks but mine has never run dry, frost valve hasn’t been open.
I suppose it’s due to it being nearly 20 years old and used a lot

 

[Manic]

Is it the type that just heats the water up ?

I retrofited a 240v heating jacket to my 2002 Hymer with the boiler insitu. The boiler was situated beneath the wardrobe so only needed the shelf above the boiler removing to gain access.

Yes it just does the water heating.

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[Lenny HB]

Yes it just does the water heating.

Probably not worth the bother then, heats up quicker and a lot cheaper to run on gas.

 

[Wagoneer]

Found a repair solution on utube entitled "Truma electric retrofit heater collar" published 31 July 2020 by Philip Davies.

He replaced the thermal fuse on the collar for £6 from RS Components.

Don't know how to post a utube vide but this link might help.

 

[Manic]

Found a repair solution on utube entitled "Truma electric retrofit heater collar" published 31 July 2020 by Philip Davies.

He replaced the thermal fuse on the collar for £6 from RS Components.

Don't know how to post a utube vide but this link might help.

Thanks, funny I’ve just watched that and then saw your post.
I will have see if my boilers the same.

 

[Manic]

I’ve contacted Truma and they’ve said it would have a collar element , so I think at some time I will check the thermal fuse the YouTube chap changed.
until then gas only.

 

[Wagoneer]

I guess, before you start taking the boiler apart, you'll check the resistance of the heating element from the external wiring. And also confirm that the 240v rocker switch isn't at fault.

The guy in the video admitted the failure of the thermal fuse was probably due to him operating the water heater with no water in the boiler. Was this the case with you ? If not, perhaps the malfunction is elsewhere.

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[Manic]

I guess, before you start taking the boiler apart, you'll check the resistance of the heating element from the external wiring. And also confirm that the 240v rocker switch isn't at fault.

The guy in the video admitted the failure of the thermal fuse was probably due to him operating the water heater with no water in the boiler. Was this the case with you ? If not, perhaps the malfunction is elsewhere.

No mines never ran dry, the switch is illuminated as normal but I haven’t looked further yet.

 

[68c]

Any chance this can be saved somewhere as a resource for the future?

 

[two]

If used constantly, I don't suppose they'll last forever (in spite of their cost).

 

[Manic]

Finally got around to removing the element and checking it, I believe the thermal cut out is faulty.
I test across the incoming to both sides of element wire and it’s good but test across them thermal cut out and it’s open circuit.
so got to source a replacement

 

[Manic]

Refitted heat element after replacing the thermo switch at a cost of £6.54 including postage (£1.80 for switch)
Easy job too.
So far it’s working

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