While you wait for answers, we may have found some information which could help you.
Click here for Heating Fault Hot WaterMy radiators not heating up?
Central heating not working?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
My central heating is not working?
fitting thermostat?
Glow worm flexicom 30cx auto air vent - how do I replace?