While you wait for answers, we may have found some information which could help you.
Success
Message
GS 24i junior boiler timer broken?
BMU error code?
Central heating not working?
My central heating is not working?
fitting thermostat?
How to fix glow worm 18 hxi ?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
Home heating systems?
My radiators not heating up?
Glow worm flexicom 30cx auto air vent - how do I replace?
I have moved into a flat am dissabled carnt get heating on unit flashing F1?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?