While you wait for answers, we may have found some information which could help you.
Click here for Pilot Going Years BoilerWhere can I get instructions for potterton Kingfisher II?
Pottertton Kingfisher Boiler Overheating ?
Potterton kingfisher 0-max knob?
Central heating radiator doesn't gets hot sometimes and sometimes does?
Potterton kingfisher 2ignition problem?
Pilot light won't relight?