The system is open vented with an f&e tank in attic,
But when ever the central heating is turned on there is a loud bang (or knock) from the 3 way valve in the airing cupboard.
But no noise at all when just hot water is selected.
Any advice gratefully accepted.
pete
But when ever the central heating is turned on there is a loud bang (or knock) from the 3 way valve in the airing cupboard.
But no noise at all when just hot water is selected.
Any advice gratefully accepted.
pete