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