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It's a normal 2 port zone valve/motorised valve directly below an identical valve that controls the heating flow. Don't think there is a 3 port valve nearby. Anyone got any idea how I can tell if the whole thing is stuffed up, or should I just replace the metal box and hope that does the...

Thanks for that. It came on no problem this morning, but it's going to need fixing sometime. I reckon I can change the head myself quite easily, it looks exactly like the Honeywell 2 port valve just above it. I'm not going to attack the pipe though. Can anyone tell me what I'm looking for...

Please can somebody help. About 6 months ago my boiler stopped producing hot water. The central heating worked fine, though unfortunately it was the middle of Summer. I called in a gas engineer who had been recommended. I'd already figured out that if you moved the lever on the back of the...