Thanks for your help. The valliant boiler is an open vent system. Air is being sucked in down the vent pipe that sits over the header tank in the loft. The airing cupboard is very noisy with gurgling air around the pipes.
Do you know the name of a good plumber in the Berkshire area that can diagnose problems without too much mess in going under bedroom carpets and floor boards?
The pump sits by the hot water cyclinder in the airing cupboard and I can see the vent pipe that sits on the inlet side of the pump.The cold feed pipe goes to the boiler down stairs in the kitchen.
I have been told there is possibly an air block in the return pipe!! Help!!!!!!!!!!!
Mary Rich
June 2010
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