Glow Worm Boiler Error Codes

Here are some of the faults on the Glow worm boiler range.
If you have a fault on you’re boiler you can check the data here.
This will give you the information to pass on to the Registered Gas Engineer when you call them out to fix the problem with the boiler.

F1 – Ignition Fault
F2 – fan
F3 – Fan Unable to reach ignition speed
F4 – Ignition Fault
F5 – Overheat Fault
F6 – Central Heating Flow Thermistor
F7 – Domestic hot water Thermistor
F8 – Tank Thermistor
F9 – Low Water Pressure Sensor
F10 – Central Return Flow Thermistor
F11 – Flow or Return Thermistor Fault
F12 – Connection fault between main PCB and display PCB
F13 – PCB memory or sensing fault
F14 – Gas Valve Control Defective
F15 – E-Bus Voltage Failure
F16 – flame detection fault
F17 – Power supply is less than 170v
F18 – User interface fault
F19 – Central Heating Thermistor Unplugged
F20 – Software Incompatibility
F22 – Low Water Pressure or ignition temperature rise too slow
F24 – Central heating return temperature
F25 – Circulation Fault
F26 – Poor Circulation
F43 – Generic Error
F70 – Software Incompatible
F73 Unable to see pump active
F77 Condensate Pump Error (optional)
No display or ER – Loose connection X51

It is a criminal offence to work on a gas appliance if you are not qualified, and licensed to do so.
ALWAYS consult the manufacturers user instructions for guidance. The instructions above are for guidance only. If unsure of any procedures, call a boiler specialist, who holds the relevant qualifications, and GAS Safe Registration.