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Heatslave pump keeps running when not selected?

My heatslave pump keeps running when hot and heating is not selected. Changed PCB but problem is still there....any clues? Linked out programmer.

Norman Burgess.
August 2008
HeatslaveHeating, Home Heating SystemsHeating System Pcb
maybe a faulty thermister, boiler thinks its too hot and is running the pump (know as pump overrun) to dissipate the excess heat......

T
August 2008

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