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DP, first off, I know I asked for advice. Thanks for pointing that out to me. Second, I'm very grateful for the advice Chris has given and any other advise received. As I know nothing about boilers (IT background), this is why I ask the questions. If this were an IT forum, I'd spell it out...

Thanks Chris. The pump is a brand new Ravenheat pump that came with the brand new CH system, and it was making the same whirring noise it has made from day one. On this low setting it just sounds like a quiet motor. The CH works fine and the HW works okay too (pardon my ignorance, I didn't...

Hi, can anyone help? I had my combi boiler fitted last year, and you just knew when the central heating switched on because of the noise from the whirring of the motor (could be heard in the living room, even though it's upstairs). My new girlfriend commented on this noise last night, so today...