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Found some honeywell wiring diagrams and did some more investigation. Have I understood the control process correctly? Timer switches on the motorised valves. When the either valve opens it closes a switch which provides a live 'call for heat' input into the switched live input on the...

Pump is wired in to the timer and running - the pump input lines on the boiler are only connected to the Live and Earth. Going to buzz the pump cable through later in case I damaged the insulation pulling the cables through. Am I correct in assuming that the pump input to the boiler should be...

I've got a Potterton Suprima 60 which about three years ago started doing the lockout problem. Thanks to some good advice from one of the many posts here on this subject, I replaced the PCB and it worked fine. Two weeks ago it started showing the same problem. I ordered the most recent PCB and...