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Mend Worcester 24 cdi Combi Boiler Pressure Leak

Worcester combi boiler pressure off scale,model 24 cdi?

Pressure needle gone past 4bar to stop pin,overflow leaking,have turned fill key other way but not done anything.Tried drain plug + hose to reduce pressure but stays as.I think guage is now kaput but dont know what to do,system still works but waitng for big bang.

John
December 2010

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