While you wait for answers, we may have found some information which could help you.
Success
Message
Intermittent boilet fails to fire on heating?
boiler will not turn off (only manually)glow-worm micron 80ff?
Loud clanging/Glow-worm Boiler?
Glow-worm micron 60ff boiler niosy ?
What can I do about a Glow-worm Flexicom 30cx fault code F11?
how to find a fault?
Glow-worm 30cxl?
Home heating systems?
water from taps is boiling hot?
radiators hot when water turned on?
how can i fix my central heating. Glow-worm ultimate?
fitting thermostat?