can someone please help!!!!
I have a potterton central heating boiler which will not light. Today
i fitted a new PCB in the mistaken belief that this was at fault. I
have power into the boiler which appears to go through all the various
switches and thermostats no problem and then on to the PCB. In turn
the PCB switches on the fan and sends power to the air pressure valve,
which returns on the NC circuit.(white wire).
I do not have power from the PCB to the gas valves. I can by pass the
PCB and power the valves seperately and i get a gas flow.
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