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Mend Vaillant Boiler Heating Diverter Valve

Vaillant boiler crash bang whallop every time it lights up?

There is a loud noise every time Vaillant boiler fires up. Had two diverter valves already and drained system. Can you help

Ron
January 2010
VaillantHeating, Home Heating SystemsBoiler Heating Diverter Valve

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