from my other new thread I posted I think we've found it's the actuator that's gone again, that'll be third one since moving in.... it's also had a new master switch I think. We're currently looking to see if we can find a better brand of actuator as apparently Danfos are prone to failure.
Ive had a similar problem on my range tribune system. After checking through the 2 port valves and other parts, i put the fault down to the time clock. I bought a new 1 and replaced it. No the system works fine without the circulation pump running when not called for
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