Quote:
Originally Posted by heero_yuy
Is your heating zoned?
If so it could be a stuck motorised valve that services the downstairs radiators.
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I’ve just spent this morning fretting that our central heating engineer damaged our motorised valve when he froze the pipe next to it in order to install an upgraded expansion vessel yesterday. It took me far longer than it should have to realise that the transformer-like hum was being caused by the valve’s natural operation, amplified by the new pipes and vessel. It’s not loud enough to hear in adjacent bedrooms but it will annoy me so I’m going to have to see if I can dampen it somehow.