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Thanks for the reply. I checked the pump and I could turn it and it seemed to be running. However, I changed the pump anyway and this has certainly cured the problem. I can only assume that the old pump was not pushing enough or any water around the system. The old pump was a pig to...

I have a Glow Worm Fuelsaver MkII boiler (about 20 years old) that had started producing a lot of banging in the pipes when the central heating and hot water timer started today. What appears to be happening is that the boiler is coming on full then the water isn't going anywhere and the...