While you wait for answers, we may have found some information which could help you.
Click here for Boiler Going Potterton ThermostatRadiators upstairs will not go off after relighting Potterton Kingfisher ?
potterton kingfisher boiler central heating not turning on?
My radiators will not go off?
Potterton kingfisher 0-max knob?
Pottertton Kingfisher Boiler Overheating ?
how can I get my potterton kingfisher CF 180 to fire up?