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Mend Raven Heat Started Valve

why does my comdination boiler over preasurise?

My raven heat boiler has started to over preasurise above its safety valve what could be causing this. It has a small leak on a rad valve which will be cured

charles griffiths
February 2010
Raven HeatHeating, Home Heating SystemsHeat Started Valve
if pressure rises when not being used disconnect filler loop look for passing valve if not passing then you leak between ch and hot water probale plate heat exchanger if ries in use the the expansion vessel req repressureing or replacing

deggsy
February 2010

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Raven Heat Boiler Over Pressure - Causes & Fixes