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Code | Description | Comment |
F1 |
Ignition fault (lockout) Failed to light |
No gas; Insufficient gas; Incorrect gas valve adjustment; Electrode defect; Ignition lead defect; Electronic igniter defective; Check air inlet duct; Check connections to igniter unit |
F4 | Ignition fault (lockout) Went out when lit | As above |
F5 | Overheat fault | Overheat stat operated; Maximum temperature exceeded; Check thermistor connections; Air in system with thermistor at maximum setting; Faulty overheat stat connection; Check that pump is wired into appliance and not from programmer. This would cause no pump overrun |
F6 | Central heating flow NTC fault | Flow NTC cable defective/broken NTC faulty Flow thermistor not fitted correctly |
F10 | Central heating return NTC fault | Return NTC cable defective/broken NTC faulty Check that thermistor attached correctly to pipe. |
F11 | No reception by main board | Connection fault between main PCB and interface; Faulty interface; Faulty main PCB (processor) |
F12 | No reception by the local user interface | As F11 |
F13 | Main board fault | As F11 |
F14 | Central heating flow t° > 95° C | System fault; Possible external pump failure; Check NTC on flow Check that pump is wired into appliance and not from programmer. This would cause no pump overrun |
F16 |
Flame detection fault (flame presence >5 s after burner stop) |
Gas valve defective |
F17 | Power supply <170 V | Check electrical supply / polarity |
F18 | Local user interface fault | Connections; Faulty interface |
F19 | Central heating NTC unplugged | Check NTC connection |
F20 | MMI software incompatible with IRIS software | Possible connection fault |
F24 | Central heating return t° >90°C | System fault; Possible external pump failure; Check NTC on return; Check that pump is wired into appliance and not from programmer. This would cause no pump overrun. |
F25 | Maximum temperature rise slope | Possible external pump failure; Air in system restricting movement of water. Insufficient circuit flow |
F26 | Maximum delta t | Check NTC on return; System fault – too restrictive?; Possible pump failure |