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Information I can give is: Gas, boiler is upstairs.Glow worm Fuelsaver MkII. I dont think it is open vented (please explain if nec) It is pumped. :?:

Every time the heating comes on, there is a loud bang in the pipes within the airing cupboard. I have bled the radiators and water comes out when I do so. I have drained the system once and it worked for about a week before going back to the banging! Any ideas???? :lol: