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Thanks for the replies I've confirmed that it is definatley the pump by wiring it directly to a plug, and the electrics trip as soon as I switch the socket on. I've been looking at pumps and am planning to buy a Grundfos 15/50 (I have no idea what these numbers mean - perhaps someone can...

Hi All About 3 weeks ago my central heating fired up in the morning and tripped the RCD/Main Switch on my consumer unit, and it has done it everytime I have tried to fire it up since. (Notice how I'm only doing something about it now is starting to get cold!! :) ) Upon reading various posts...