Sounds like a leak, which will severely damage if you don't fix it...
i don't think so because when the main power outside is switched off, there is no more sound. So it must be something to do with electrical.
PLEASE READ: To register, turn off your VPN (iPhone users- disable iCloud); you can re-enable the VPN after registration. You must maintain an active email address on your account: disposable email addresses cannot be used to register.
Sounds like a leak, which will severely damage if you don't fix it...
Still could be a leak if you have baseboard heating and it is controlled by a thermostat.
It's probably some electrical timer, maybe on the heating or some lights. The mechanical ones often as they get older start making a noise. If that is what it is then it is nothing to worry about. Older cookers have mechanical clocks too also old alarm clocks.
what contractors are you talking about?
Are they plumbers or a handyman?
