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Mend Sime 80C Wrong Combi Water

whats wrong with my sime 80c combi boiler?

hi i have a sime 80c combi boiler my problem is that when the boiler is on water flows through the release valve and goes out side ihave changed the diaphram and thewater rate adjuster but stillthe same if i turn the cold water feed of for the hot water to my kitchen and bathroom central heating works fine and pressure goes down to normal please please help

john howard
March 2009
SimeSime 80CHeating, Home Heating SystemsWrong Combi Water
no presh valve workin fine but yes it does flow outside when central heating on when feed for hot water to the sink taps is on

john howard
March 2009
is there a fault with the pressure relif valve? is it leaking sometimes or all the time.

ben
March 2009

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Sime 80C Boiler: Water Leak & Pressure Drop