We may have found other answers which could help you.
Click here for Central Heating Thermostat Overheat
Glow worm 45/60 not firing up?
Why are my radiators are not heating?
loud bang when boiler fires up, fault code F1 if it fails to fire?
What does F43 error message mean on Glow Worm 24/30cx?
Glow Worm Fuel Saver F not working properly ?
Replacing LP112 Programmer?