We may have found other answers which could help you.
Click here for Thermocouple Boiler HeatingGlow worm flexicom 30cx auto air vent - how do I replace?
GS 24i junior boiler timer broken?
Central heating not working?
Home heating systems?
fitting thermostat?
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?