Truma leaking hot water overflowing (1 Viewer)

Sep 8, 2020
18
13
Funster No
75,619
MH
Swift Escape
Exp
Since 2020
Just flashed up the boiler ready to go away. Water heating beautifully but the clear pipe from the boiler hot water going through the floor is constantly dripping. What’s causing it? Can I go away like it without causing damage? Can I clean it out if it’s something sticking or does it need replacing.
Thanks

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Lenny HB

LIFE MEMBER
Oct 18, 2007
50,252
138,689
On the coast in West Sussex
Funster No
658
MH
Hymer B678 DL
Exp
Since 2008 & many years tugging
There is a valve inside the Tee piece new valve is about a tenner. The valve is to let air out when the boiler fills. You can temporarily clamp the clear pipe until you get a new one.
You could try taking the Tee off and soaking in white vinegar & water to clear any calcium that may be causing it to stick.
 
OP
OP
Moss
Sep 8, 2020
18
13
Funster No
75,619
MH
Swift Escape
Exp
Since 2020
There is a valve inside the Tee piece new valve is about a tenner. The valve is to let air out when the boiler fills. You can temporarily clamp the clear pipe until you get a new one.
You could try taking the Tee off and soaking in white vinegar & water to clear any calcium that may be causing it to stick.
Thanks for responding. I take it I will need to drop all the water and open the boiler dump valve.

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pwilmo

LIFE MEMBER
Oct 17, 2009
284
443
Kings Lynn, Norfolk
Funster No
8,936
MH
Auto Roller 747
Exp
Since 2005
Hi there Lenny
Not to nit pick, your knowledge and experience are far beyond mine.
However the valve at the top is to let air IN when emptying the boiler .. to prevent a vacuum above the water level stopping the boiler emptying.
Your remedy is spot on though, clean or replace the valve, as it is stuck open letting water pressure through
 
Jan 11, 2022
422
380
Funster No
86,220
MH
Pilote P732 2011
Exp
3rd Time around, since 2000
You had better tell Truma then as they obviously don't how the boiler they designed works. :giggle:
Surely it’s a pressure release valve, if it was to let air in it would not have the drain pipe attached.

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pwilmo

LIFE MEMBER
Oct 17, 2009
284
443
Kings Lynn, Norfolk
Funster No
8,936
MH
Auto Roller 747
Exp
Since 2005
I have had the valve apart and the valve works one way ..lets air in, but obviously they are aware the valve is prone to scale/ bits blocking the valve in the open and not closing properly
hence the attached outlet pipe .
exploded2jgs.jpg
 
Last edited:

pwilmo

LIFE MEMBER
Oct 17, 2009
284
443
Kings Lynn, Norfolk
Funster No
8,936
MH
Auto Roller 747
Exp
Since 2005
And of course Truma know how their boiler works and the valve is prone to sticking open, that is why they have added a pipe so dripping is visible and directed out of the van.

No Lenny the valve opens inwards and close when pressure is applied by the boiler fill as per diagrams

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Last edited:
OP
OP
Moss
Sep 8, 2020
18
13
Funster No
75,619
MH
Swift Escape
Exp
Since 2020
Thanks everyone for your thoughts found the culprit the bits were in the bottom probably blocking it. Ordered a new one

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