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Motorhome Facts Forum Index -> Generic Hints & Tips -> Hymer -> Truma C3400 problems
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Truma C3400 problems
450710 PostPosted: Sun Jul 06, 2008 5:45 pm Thank this member for this postReply with quote
mowbotman Subscriber 24/06/2009 
 
Joined: Aug 14, 2005
Posts: 3


MH: Hymer B544
Campsites
Location: West Bridgford,Nottingham


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Hi
Could you help me please with the above heater, the problem I have is that water will not come out of the heater, not cold or hot,( the cold side of the motor home is fine ) I have checked the dump valve and that is working fine, if I switch it off water is dumped below the van, and when eventually I get it to stay down, but water will not flow thought the heater, is the problem that valve? can I take both pipes of it and connect them together, just for testing, I am going away to France on Thursday and cannot get anyone to look at it before then
thanks
wayne
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450723 PostPosted: Sun Jul 06, 2008 6:07 pm Thank this member for this postReply with quote
richardjames Subscriber 14/11/2009 
 
Joined: Feb 01, 2006
Posts: 493
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MH: CI Cipro 55
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Location: Evesham

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you may have an air lock! Try running the pump after opening all the taps on the hot side
regards
Richard
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Re: Truma C3400 problems
450738 PostPosted: Sun Jul 06, 2008 6:38 pm Thank this member for this postReply with quote
JockandRita Subscriber 08/01/2010 
 
Joined: Jun 01, 2005
Posts: 2708
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MH: Hymer E690
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Location: Lincs/Cambs border

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mowbotman wrote:
Hi
Could you help me please with the above heater, the problem I have is that water will not come out of the heater, not cold or hot,( the cold side of the motor home is fine ) I have checked the dump valve and that is working fine, if I switch it off water is dumped below the van, and when eventually I get it to stay down, but water will not flow thought the heater, is the problem that valve? can I take both pipes of it and connect them together, just for testing, I am going away to France on Thursday and cannot get anyone to look at it before then
thanks
wayne


Hi Wayne,

Try first, what Richard has advised. It can take some time to clear the air lock. You should be able to hear the rush off air, as the boiler fills.
If the pump is removeable from the tank, you could pop it into a bucket of water, and operate the tap then, to see what the pump is actually doing. Is it actually pumping, or is the motor just running. If it is the latter, the pump impeller shaft has broken, ie, new pump.

I think that there is probably a small air vent in the top of the pump. Give it a shake whilst submerged to free any air. Once primed, it should pump well.

As well as the dump valve being closed, are the water pipe drain taps closed? (Small round white nylon valve taps)

Hope this helps.

Jock.

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