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Thanks for replying so quick, my boiler is a Potterton combi 80 and when I first started experiencing poor circulation I had a heating fitter fit a new pump this was 3 weeks ago I called him back as this hadn't cured the fault and he suggested that the system might need a power flush which I am...

I have recently developed problems with some of my central heating rads not getting hot. when the roomstat is calling for heat the boiler fires up and stays on for about a minute switches off for 2 or 3 minutes then fires up again and the underfloor pipework start banging like expansion noises...