The noise kicks in about a minute after the boiler ignites. It seems to be roaring between the boiler in the kitchen and the hot water tank in the airing cupboard.
Is it possible to get air in the pipes and how would I get rid of it.I have bled the radiators and there was no air in them.
The system has been emptied and flushed within the past couple of years so should be clear of any muck, any ideas?
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