Hi, potterton mf 80 will not fire up.
history; voltages to pl3 and pl1 intermittant, unknown cause.
voltages at pl1-3 return, flow chart points to gas valve, pilot solenoid open circuit (v1)
fit new gas valve (vk4100t) Voltages at pl1 pl3 low.
pcb inspection, all appears ok.
Next morning...