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Mend Worcester Bosch Greenstar 30Si Heating Diverter Valve Pressure

loosing pressure?

My greenstar 30Si is loosing pressure .I have checked all pipes for leaks and all seem dry.Could this be diverter valve or the expansion vessel.

steve
January 2012
Worcester BoschWorcester Bosch Greenstar 30SiHeating, Home Heating SystemsHeating Diverter Valve Pressure
look for pressure relief valve,any water out side if yes, replace,could be fault at vessel ,see water come out from
valve ir not need pump it to value on vessel

ltd
January 2012

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Worcester Bosch 30Si Losing Pressure - Fixes