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    Combi boiler - whirring noise when hot water ran

    A general question here for anyone who can please help?: Combi Boiler - when hot water is ran, it makes a whining noise. Not when heating is on (tested it) - hot water is ok though, it;s just the noise. e? What could it possibly be (Biasis combi) Been here for the 7 years + I've...
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