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Thank you for your help, i have read a whole lot about boilers today !! would you be good enough to tell me one more thing, is the PCB 5111603 a complete swap PCB or the one i've read about that needs re wiring etc ??

Yes the boiler is a potterson suprima . I detect that you've come across this model before, please share what you know.

My central heating system is causing misery. My potterson boiler, keep going into lockout mode, My water is very hot, but before my rads reach the temperture set by the room thermo, the boiler goes into lockout mode. I have also noticed that the downstairs rads, are cooler than up stairs...