We may have found other answers which could help you.
Click here for Glow Worm Swift Flow 80I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?
Central heating not working?
My radiators not heating up?
BMU error code?
GS 24i junior boiler timer broken?
Which way to turn slotted screw to adjust water pressure up on a glow worm ?