Hi, I've put this under heating issues - but not sure that's correct.
I moved into a property on 7th November which already has Nest 3 learning thermostat linked to heating system and separate hot water tank. For the last 4 weeks or so, there has been a constant sort of pump noise coming from the airing cupboard (where the hot water tank is) even when it's not scheduled to be on and the thermostat shows it to be off. When i say constant, I mean 24hrs a day. We scheduled in a boiler engineer as the boiler was due a service anyway, that then got postponed twice and sod's law, the noise stopped yesterday and the engineer came this morning. Without hearing the sound he was unable to diagnose and we couldn't force it to happen. He thought it might have been the heat protect/legionella thing which might have gotten stuck on for some reason but said if it was that then it's linked to the Nest rather than the boiler. Sod's law again - this afternoon it's started up again. I'm at my wit's end with this constant sound rumbling in the background when I go to bed and possibly using lots of unnecessary energy (the last 2 mornings while the problem hasn't been there the smart meter reading has been much lower upon waking in the morning).
Anyone any ideas what this could be or how to fix it? I am not technical at all - so will need any suggestions spelling out in simple language please!!!
