Soon after switching off the central heating (say 5 minutes), I experience a loud humming noise like a fog horn. It seems to be located in pipes under my bathroom floor - as I walk across the bathroom the noise frequency changes - any ideas or is the house haunted.
13yr old property - yplan - Baxi boiler.
Recently serviced after we moved in and this is the 1st time the CH has been used in anger.
13yr old property - yplan - Baxi boiler.
Recently serviced after we moved in and this is the 1st time the CH has been used in anger.
