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what is wrong with back boiler?

when i light my open fire the back boiler causes a banging noise in the radiators - what could the problem be ??
nryan, January 2011
its overheating the water to the cylinder. turn the pump on to heat the radiators. it should quieten down.

S.PRIESTLEY gas fitter in barnsley, January 2011
air lock or most likely the pump is faulty

brian, January 2011