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A banging noise coming from my Potterton suprima boiler?

My Potterton boiler is allowing hot water downstairs and the radiators to work upstairs but the radiators won't work downstairs and the boiler is making a horrific banging noise! Can anybody help please!
Sam, January 2010
sounds like the pump wants replacing

roy b, February 2010
sounds like circulation problem

b, January 2010
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