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Thanks very much for the information. Have tested the pump output on the terminal block whilst the boiler is fired up and get no voltage. Looks conclusive that the PCB has partially failed. Will call Potterton tomorrow as suggested and will let you know how I get on.

:?: I am having a problem with our heating system. Everything is working as expected except that the pump is not being run. Therefore boiler (Suprima 80L) quickly and correctly cuts out. Pump appears to be free but I cannot detect any power to the pump. System is four years old Y plan...