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Had a look yesterday and we're pretty sure we're on the right track. The boiler was running all the time the pump was. Had the valve head apart and checked continuity through the switch while pressing it repeatedly. It was inconsistent/sticking. Gave the switch a few sharp taps and put it back...

Would that mean the water in the tank would always be hot? It sounds like that isn't the case. We should be able to double-check tomorrow. He has mentioned the floor in his bathroom's always warm (and maybe the radiator but I'm not sure). Would that be a heatsink for the system, that would make...

Thanks a lot The hot water is getting hot, which I guess means the motor/valve are probably ok? I've had a search and found a video of someone pulling the valve head apart, would the microswitch in there be a likely culprit? If not that, then we should check how things are connected between the...

I wondered if anyone could help please. A friends water pump keeps running forever. I don't have every detail about his setup, but know the following: Its not a combi boiler, but an older-style hot water tank. His wiring centre is branded Danfoss, as are the two motorised valve heads (one for...