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home Fix label Heating label_important Home Heating Systems category Vaillant

Vaillant combi boiler over pressuring?

My 20 year old Vaillant combi boiler is over pressuring when heating is on
Peter, September 2008
home Fix label Heating label_important Home Heating Systems category Vaillantdone
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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