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Please help me determine what this incredibly annoying noise is!

100hz · 2018-12-04 22:23:12

An intermittent, 100hz hum which im hearing in my house is doing my nut in. Its happening pretty much all the time, all night and started about 2 weeks ago. it continues to happen when i turn off power to the property. It continues to happen when i turn the stop !!!! off to the property. I have a combi boiler but im sure…

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JohnB47 Posts: 2,668 Forumite

6 December 2018 at 1:58PM

My central heating thermostat often buzzes when its about to call for heating, even when the CH is not in an 'on' phase. Very quiet and not a recognizable frequency though.

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