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Bolshy, Thanks for your reply. I've changed the PCB with a direct replacement and I've left the jumpers exactly where they are. What I wanted to know was if anyone knew what the actual effect of jumper configuration is as I have the commissioning manual and it doesn't not explain it at...

Hi, Our new build house was fitted with a Potterton Promax 15/2 HE Plus boiler heating a thermal store for mains fed hot water and radiators with TRVs (except 4 of them) in a 'Y' plan configuration. I've never been overly happy with this setup and we've been having an ignition lockout issue...