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Mend Bosch Condensing Combi Boiler Heating

combi boiler make a big bang sound when heating on?

it happens every 20mins or so, when heating is on only, just one big bang. had it serviced and its still doing it. its a bosch condensing combi boiler.

debs
February 2010
BoschBosch Condensing CombiHeating, Home Heating SystemsBoiler Heating Combi

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Bosch Boiler Bangs - Causes & Fixes