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When I changed the thermistor there was a white paste looking like a conductive paste. Since I changed it the boiler barely turns off after scheduled heating time over + runover time. Previous to the change the boiler was stopping but the pump was still running, but now both are working. Oddly...

I see what you mean. The motorised valve can not send power to itself it gets it from the boiler which in turn may get it from the thermostat/ programmer which is Hive and was rewired. So when CH or HW is on I can see the green light indicating the "command" was sent to the boiler. IN this case...

I agree, but I thought this was the best thread to keep the content. Can you elaborate on what parts you mean by external controls?

Hi all, I am facing the same issue as eliseman. The work done so far is as follows: 1) Replaced the 3-way valve with the head, (along with new wiring, for the pump too). 2) Replaced the hot water tank temperature sensor 3) Replaced Honeywell Home T4360A Frost Thermostat 40C to 80C T4360A1009...

Hello. Can I replace pcb lmu30 211b159 with lmu30 211a159 ? Should it work?