While you wait for answers, we may have found some information which could help you.
Click here for Fire Lit PottertonRadiators upstairs will not go off after relighting Potterton Kingfisher ?
My radiators will not go off?
Pilot light won't relight?
Where can I get instructions for potterton Kingfisher II?
Potterton kingfisher 0-max knob?
potterton kingfisher boiler central heating not turning on?