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from the thermostat within. Last heard loud banging noises within the boiler. Have changed the water pump and the 3 way motorised valve yesterday and bled the system carefully inc. all radiators, pump itself and the bleeding valve at the top of the boiler. Any help? When switched on the...

Potterton Prima F boiler, (approx 6 years old) few months ago, heard lots of noises from the boiler, realised that it was due to air in the system and bled all radiators - there was a lot of air in the downstairs radiator, boiler worked fine for a few weeks and then started to emit some sort of...