Glow-worm Fault Codes
Searchable list
Glow-worm Fault Codes
Boilers covered:
- Betacom 2 / Betacom 3 / Betacom 4
- Energy / Energy Combi / Energy LPG
- Energy7 Combi / Energy7 System
- Easicom / Easicom 2 / Easicom 3 Combi / Easicom 3 System
- Essential Combi / ProCombi Essential
- Ultimate 2 / Ultimate₃ Combi / Ultimate₃ System
- Compact Combi — current generation / Compact Combi LPG
- MicraCom Combi
- Sustain Combi / Sustain System / Sustain Regular
- Energy 35 Store
- Ultracom₂ 35 Store
- Glow-worm CI / SI / cxi / hxi / sxi
- Glow-worm Ultrapower sxi
- Ultracom cx / cxi / hxi / sxi
- Flexicom hx / cx / sx
- Ultracom₂ cxi / sxi
- Glow-worm Xtramax HE
- Xtrafast 96/120 / Xtrafast 96/120E1
Note: Codes may appear with or without the decimal point. F.22 / F22 and ignition codes are common. Confirm with the specific model manual.
Modern / Energy, Ultimate, Betacom, Ultracom Range
| Error code | Possible fault | If ticked try the troubleshooter |
|---|---|---|
| F.00 / F00 | Flow temperature sensor fault | ✕ |
| F.01 / F01 | Return temperature sensor fault | ✕ |
| F.10 / F10 | Flow temperature sensor short circuit | ✕ |
| F.11 / F11 | Return temperature sensor short circuit | ✕ |
| F.12 / F12 | Cylinder temperature sensor short circuit / connection fault | ✕ |
| F.13 / F13 | DHW cylinder temperature sensor short circuit / PCB memory fault | ✕ |
| F.20 / F20 | Safety switch-off – overheating temperature reached | ✓ |
| F.22 / F22 / F9 | Low water pressure / ignition temperature rise too slow | ✓ |
| F.23 / F23 | Temperature difference too great (circulation fault) | ✓ |
| F.24 / F24 | Temperature rising too fast (circulation fault) | ✓ |
| F.25 / F25 | Flue gas temperature too high / circulation fault | ✕ |
| F.26 / F26 | Gas valve fault | ✕ |
| F.27 / F27 / F16 | Flame detection fault | ✓ |
| F.28 / F28 / F1 / F4 | Ignition unsuccessful when starting up | ✓ |
| F.29 / F29 | Loss of flame during operation | ✓ |
| F.32 / F32 | Fan fault / incorrect air pressure | ✕ |
| F.49 / F49 | eBUS voltage fault | ✕ |
| F.61 / F61 | Gas valve control system fault / main board fault | ✕ |
| F.62 / F62 | Gas valve switch-off control fault | ✕ |
| F.63 / F63 | EEPROM error | ✕ |
| F.64 / F64 | Electronics / NTC error | ✕ |
| F.65 / F65 | Electronics temperature too high | ✕ |
| F.67 / F67 | Main board fault | ✕ |
| F.68 / F68 | Flame signal fluctuation | ✕ |
| F.70 / F70 | User interface incompatible with main board | ✕ |
| F.72 / F72 / F84 | Permanent temperature difference between flow and return sensors | ✕ |
| F.73 / F73 / F74 | Heating circuit pressure sensor fault | ✕ |
| F.75 / F75 | Pump / pressure sensor fault | ✓ |
| F.76 / F76 / F83 | Thermal fuse fault / no water in installation | ✕ |
| F.77 / F77 | Condensate pump error / gas valve motor fault | ✕ |
| F.85 / F85 | Underfloor heating contact fault / flow and return sensor fault | ✕ |
| F.86 / F86 | Underfloor heating contact fault | ✕ |
| ERR / F12 / F18 | User interface fault | ✕ |
Older Models
Many of the F. codes above also apply to earlier Betacom, Easicom, Xtramax, Xtrafast and similar models. F.05 was more common on some older ranges for overheating. Confirm with the specific handbook.