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@Madrab It's a constant hum kind of ring like the noise the fridge makes but quieter as though under the floorboards but still there with power off to house.

Yes, main switch turned off to house. Cold water supply pipe turned off to house.

@johnny2007 It's electric

@Burnerman, No I'm detached, it sounds like the noise the fridge makes but quieter and In all rooms.

@Burnerman It's still there when I turn the switch off under the central heating control panel.

Hi All, I have a constant but quiet ringing noise in all rooms, I've turned both water supply and electricity off but the noise remains. I had new water supply pipe fitted recently, could the noise be from that travelling through all the central heating pipework even with the stopcock turned...