In my daughters kitchen there's a constant background noise of water flowing through pipes. (Mains pressure flow sounds, not trickling noises).
Turning the mains tap under the sink off makes it quieter but it never goes away. Turning the CH (combi boiler) off makes no difference.
I thought maybe it was a flow noise travelling up through the incoming main but when I listen to the main incomer where it passes under the hall on the way to the kitchen, it's silent.
There's no obvious flooding in or under her flat that we've detected so far. Her flat is the ground floor of a three story end terrace house that's been split into flats so it's difficult to be certain about any of the plumbing routes or to know what's "live".
I must admit I'm baffled. Any suggestions?
Tim