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Mend Vaillant Combi Boiler 20

Vaillant combi boiler over pressuring?

My 20 year old Vaillant combi boiler is over pressuring when heating is on

Peter
September 2008
VaillantHeating, Home Heating SystemsCombi Boiler 20
If only on heating, probably pressure vessel is leaking and/or needs repressurising.If pressure rises over time then water to water ( DHW ) heat exchanger could be letting by ( bleeding from cold supply through heat exchanger into heating circuit )

daveash
September 2008
Faulty or knackered expansion vessel.

Gasman
September 2008
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