While you wait for answers, we may have found some information which could help you.
Success
Message
BMU error code?
GS 24i junior boiler timer broken?
My radiators not heating up?
My central heating is not working?
Home heating systems?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?
Central heating 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?
I have moved into a flat am dissabled carnt get heating on unit flashing F1?
Glow worm flexicom 30cx auto air vent - how do I replace?