We may have found other answers which could help you.
Click here for Heating Boiler Repairfitting thermostat?
How to fix glow worm 18 hxi ?
Glow worm flexicom 30cx auto air vent - how do I replace?
GS 24i junior boiler timer broken?
My radiators not heating up?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?