Help needed please water/boiler pump (1 Viewer)

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faraway

LIFE MEMBER
Oct 10, 2016
747
613
Kent
Funster No
45,517
MH
Chausson Flash 10
Exp
Getting better
Ive been away without the motorhome (Chausson Flash 10). Boiler was off, there was water in the tank but no freezing weather etc and it’s warm weather now.

When I turn the water pump on at the control panel above the motorhome door, the boiler is dumping water outside. This happens whether the boiler itself is on or off. The photos below show lights and positions etc next to the actual boiler under the seat. The boiler is a Truma, operates on gas only. Can anyone help please?
 

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faraway

faraway

LIFE MEMBER
Oct 10, 2016
747
613
Kent
Funster No
45,517
MH
Chausson Flash 10
Exp
Getting better
Thanks. Where is the dump valve? I can only see the red knob as in the photo, nothing else.
 
OP
OP
faraway

faraway

LIFE MEMBER
Oct 10, 2016
747
613
Kent
Funster No
45,517
MH
Chausson Flash 10
Exp
Getting better
Seems to be ok now. The valve is yellow in this case. Appreciate the help

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