While you wait for answers, we may have found some information which could help you.
Click here for Light Boiler ThermocouplePotterton kingfisher 2ignition problem?
Where can I get instructions for potterton Kingfisher II?
Potterton kingfisher 0-max knob?
potterton kingfisher boiler central heating not turning on?
Central heating radiator doesn't gets hot sometimes and sometimes does?
My radiators will not go off?