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?
How to fix glow worm 18 hxi ?
Central heating not working?
My central heating is not working?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
fitting thermostat?
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 ?
My radiators not heating up?
I have moved into a flat am dissabled carnt get heating on unit flashing F1?
Home heating systems?