While you wait for answers, we may have found some information which could help you.
Click here for Boiler Switch Requiredfitting thermostat?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
My radiators not heating up?
Glow worm flexicom 30cx auto air vent - how do I replace?
BMU error code?
How to fix glow worm 18 hxi ?