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Hi got a potterton MF RS 60 boiler is sparking but no pilot?

Hi got a potterton MF RS 60, Boiler is sparking but no pilot? Changed gas valve but still same problem also changed pcb as trial and error but same again any ideas anyone?
stevehpw, December 2012
Is fan working ,yes,change air pressure switch

ltd, December 2012
link Click here to see other fixes for Potterton MF RS 60.