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Gem boiler -Central heating is working but no hot water makes groaning nois?

Central heating working fine but when hot water taps turned on you hear a loud groaning noise and only hotwater for 1 min.

Diverter valve has been replaced

Gem combi Boiler gc no 4717701.

albert mcilvenny
March 2008
Heating, Home Heating SystemsBoiler Working Hot
sounds like the plate heatexchanger may be partially blocked

T
March 2008

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Mend Home Heating Systems
Mend Heating, Home Heating Systems
Free repair help for home heating systems