We may have found other answers which could help you.
Click here for Heating Boiler Fault
Glow Worm Fuel Saver F not working properly ?
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?
how can I fix my Micron 80FF Glow Worm Boiler?
Glow worm 100E small burner flame, now hot water?
Replacing LP112 Programmer?