We may have found other answers which could help you.
Click here for 50ff Boiler CutsI have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
My radiators not heating up?
Central heating not working?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?
GS 24i junior boiler timer broken?
How to fix glow worm 18 hxi ?