While you wait for answers, we may have found some information which could help you.
Click here for Gas Boiler Burnerhow can i fix my central heating. Glow-worm ultimate?
Glow-worm 30cxl?
Loud clanging/Glow-worm Boiler?
radiators hot when water turned on?
boiler will not turn off (only manually)glow-worm micron 80ff?
fitting thermostat?