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?
Glow worm flexicom 30cx auto air vent - how do I replace?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?
I have moved into a flat am dissabled carnt get heating on unit flashing F1?
How to fix glow worm 18 hxi ?
Home heating systems?
fitting thermostat?
My radiators not heating up?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
My central heating is not working?