Help Truma dumping water (1 Viewer)

May 23, 2013
1,781
2,814
Not on the Coast East Sussex
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Hi

Just filled up with water in preparation for our trip to Germany leaving Boxing day and with the water pump on the Truma boiler is dumping all the water.

The push/pull valve is in the closed position and the temperature should is above 8 degrees currently, we have a C3402 and I have put the heating on to see if that fixes the problem but any helpful suggestions would be greatly appreciated.
 

GJH

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Aug 20, 2007
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Do you also have a yellow manual lever like the one in the diagram? If it is in the horizontal position (as it should be) try opening it and then closing it the other way. Sometimes they don't close properly.
 

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Apr 23, 2010
943
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Isle Of Man
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MH
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4 years
Hi you also have a frost protected valve some have a blue knob on the top of a black casing whch has a small button on or near its base that must be pushed in and remain in,it can be in colder area of your MOHO i.e. under the kitchen sink check that this is in.

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Lenny HB

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Oct 18, 2007
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Common problem is the air vent valve in the "T" connector at the top of the heater where the hot water outlet is.

Leisure Shop Direct stock them.


Obviously too late to get one for Boxing day, may get away with cleaning it, take it apart and soak in a 30%-50% solution of hot water and white vinegar (white wine vinegar works best).
If it is the valve & cleaning doesn't work should be easy to pick one up in Germany, I think the same valve fits all the Truma combi's.
 
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orridge
May 23, 2013
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thanks all, just back from Sons nativity.

@Graham it's the push/pull type

@Lenny thanks will have a look at that

The push/pull valve seems to be working ok as when it's open it dumps what but when it's closed and the water pump is on it also dumps the water.

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orridge
May 23, 2013
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I have a red valve by the boiler but I am at a loss to find a blue valve anywhere. Have checked all the cupboards but nothing.

It's a Euramobil A Class so even had a look under the floor.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
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On the coast in West Sussex
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I have a red valve by the boiler but I am at a loss to find a blue valve anywhere. Have checked all the cupboards but nothing.

It's a Euramobil A Class so even had a look under the floor.
That is because you don't have one. The blue is the latest mechanical dump valve on the C4 & C6 Combi's, earlier versions C6000, C 6002 etc., had a red electrically operated dump valve.

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orridge
May 23, 2013
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I am not sure if it's related but we are getting minimum water out of the taps when the boiler is dumping water with the pump running. If the valve is in the up (closed) position how can the water get out when the pump if running but not when it is not running ?
 

Lenny HB

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Oct 18, 2007
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Check and make sure which pipe the water is flowing out of under the van, there should be a two pipes one for the dump valve and one for the vent valve. I'm betting on it being the vent valve where the hot water draw off is.

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Lenny HB

LIFE MEMBER
Oct 18, 2007
52,375
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On the coast in West Sussex
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Good news, it is only there to vent air out of the boiler while filling, should be able to clamp it off as a tempory fix.

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f6c

Nov 7, 2010
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No clip it at the end of the plastic pipe under the van. ie outside:xgrin: don't panic i had this problem for 4 weeks in Spain this year. The new part cost about ÂŁ5:00 PM if you want.
 
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orridge
May 23, 2013
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it would appear to be a faulty vent valve so thank you Lenny, clamping has reduced the flow enough to use the taps whilst we source a replacement part next week in Germany.

Merry Christmas all and a special thanks to Richard @f6c for taking time out of his busy christmas to speak to me on the telephone to troubleshoot most appreciated.

Guy
 
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dave newell

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Oct 31, 2008
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Telford, Shropshire
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Good news, it is only there to vent air out of the boiler while filling, should be able to clamp it off as a tempory fix.

Whilst you made a correct and sensible diagnosis I'm afraid I disagree with your description of this valve's purpose Lenny, it is not there to vent air out of the boiler, it is there to allow air into the boiler when draining down.

D.

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orridge
May 23, 2013
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Well yes it was a faulty vent valve and easily found in Germany for about 4 euro so thanks for all the suggestions.

Shame the exhaust just came loose on the motorway and currently awaiting ADAC to come and give us a tow. Hope that safeguard cover is working fine.
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
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Turning into an interesting trip, they come in 3's you know, we are waiting for the 3rd.:xgrin:

Good luck with getting it sorted.

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Bertie Bassett

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Jul 25, 2014
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Well yes it was a faulty vent valve and easily found in Germany for about 4 euro so thanks for all the suggestions.

Shame the exhaust just came loose on the motorway and currently awaiting ADAC to come and give us a tow. Hope that safeguard cover is working fine.
Good luck but ADAC on the ball both times we have called for assistance over the last 27 years.(y)
 

Lenny HB

LIFE MEMBER
Oct 18, 2007
52,375
146,644
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
3rd one is the gas is playing up and only filling up the first bottle.
Oh no!
Could be sticking non return valve in the bottle that is not filling, can't think of any other reason for it.
How cold was it when you filled up? I've had problems when below zero it's taken over 10 min to fill once, suspect garage tanks were low.
Probably worth trying another garage pressure might have been on the low side.

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