While you wait for answers, we may have found some information which could help you.
Click here for Moved House FittedI have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
My central heating is not working?
fitting thermostat?
Home heating systems?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?
Glow worm flexicom 30cx auto air vent - how do I replace?