While you wait for answers, we may have found some information which could help you.
Click here for Old Not IgnitingI have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
How to fix glow worm 18 hxi ?
GS 24i junior boiler timer broken?
My radiators not heating up?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?
My central heating is not working?