We may have found other answers which could help you.
Click here for Boiler Heating Thermocouple
My radiators not heating up?
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 ?