While you wait for answers, we may have found some information which could help you.
Click here for Boiler 24 Monthswater from taps is boiling hot?
Intermittent boilet fails to fire on heating?
radiators hot when water turned on?
Loud clanging/Glow-worm Boiler?
Glow-worm micron 60ff boiler niosy ?
What can I do about a Glow-worm Flexicom 30cx fault code F11?