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seems to have been that. took it off messed about and its working at mo so fingers crossed. thanks

pipes going to it are a, b ,ab ? 3way i tink can any1 else confirm ?

a couple of day ago my heating stopped working, well the heating on its own anyway. now the hot water works but also runs the heating so when water is on so is heating even if heating is set to off on programmer, the room thermostat has no control over the heating either. if i just put the...