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Thanks for the quick replies:-) I've Googled the zone valves but can't find them in the air cupboard around the hot water cylinder. There are four cables around it. Two lead to water pumps, one to the immersion heater(I think) and the other to what looks like a temperature probe in the hot...

Sorry for being clueless, but where would I find the zone valve and how should I check it?

Hi all. I'm new to this forum and afraid I don't know anything about boilers, which is a shame as mine is playing up! I had a look through the FAQ section but didn't see anything that helped. The central heating hasn't been used since last winter apart from firing it up about twice during...