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boiler service, boiler repair, emergency repair
Glowworm Flexicom 30 CX Boiler Fault Codes
| Code | Description | Possible Cause |
| F1 | Boiler has attempted to light 5 times and failed on all occasions |
Gas tap is closed. Gas valve connector is loose, unconnected, faulty, or wires are trapped. Ignitor connectors are loose, unconnected, faulty or trapped. Faulty ignitor. Low gas inlet pressure. Incorrect gas valve adjustment. Electrode ignition leads loose, unconnected, faulty or trapped. Electrode broken, defective or position incorrect. Air inlet blocked, flue inlet blocked, flue duct leaking. Earthing connection loose, disconnected. Condensate blocked. |
| F3 | Fan fault | Fan speed incorrect. Fan connector loose, unconnected, faulty or wires trapped. Faulty fan. |
| F4 | Flame goes out whilst lit during a demand |
Gas tap is closed. Gas valve connector is loose, unconnected, faulty, or wires are trapped. Ignitor connectors are loose, unconnected, faulty or trapped. Faulty ignitor. Low gas inlet pressure. Incorrect gas valve adjustment. Electrode ignition leads loose, unconnected, faulty or trapped. Electrode broken, defective or position incorrect. Air inlet blocked, flue inlet blocked, flue duct leaking. Earthing connection loose, disconnected. Condensate blocked. |
| F5 | Overheat | Boiler has overheated - allow to cool then press reset button. |
| F6 | CH Flow Thermistor connection fault | Thermistor wires unconnected, faulty, trapped. |
| F7 | DHW Flow Thermistor connection fault | Thermistor wires unconnected, faulty, trapped. |
| F9 | Pressure | Water pressure connector loose, unconnected, faulty or wires trapped. Water pressure sensor faulty. Pump ceased, faulty. |
| F10 | CH Return Thermistor connection fault | Thermistor wires unconnected, faulty, trapped. |
| F11 | Flow and/or return NTC faulty | Thermistor wires unconnected, faulty, trapped. |
| F13 | PCB Memory or sensing fault |
Loose connections on main PCB or display PCB. Central heating flow or return thermistor wires unconnected, faulty, trapped. Electrode ignition leads loose, unconnected, faulty or trapped. Earthing connection loose or disconnected. |
| F14 | Gas valve control defective |
Gas valve connector loose, wires unconnected, faulty or trapped. Faulty main board. Faulty gas valve. |
| F15 | eBus voltage failure | Short circuit on eBus, overload on eBus. |
| F22 | Low water pressure or ignition temperature rise too slow. |
Not enough water in the system. CH Flow or return thermistor wire loose, faulty, trapped. CH Flow or return thermistor not connected to pipe correctly. Air in the system. Faulty pump or pump speed too fast. |
| F25 |
CH flow temperature rise too high during operation. CH return temperature rise or temperature difference too high during operation. CH temperature difference between flow and return too high during operation. |
Check thermistors are connected to pipes correctly. Air in the system. System is too restrictive. |
| F43 | Generic error | Check all electrical connections - internal and external. |
| F70 | Software incompatible | Telephone group service. |
| F77 | Condensate pump error (option) |
Trapped, faulty wiring, blockage in condensate pump. |
| No display or Er displayed. | Check connection from display PCB to main PCB connector X51. |
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