We may have found other answers which could help you.
Click here for Boiler Heating Pressure
I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
Central heating not working?
My radiators not heating up?
My central heating is not working?
Glow worm flexicom 30cx auto air vent - how do I replace?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?