Navien Combi Boiler Error Codes Check out the table below to find your Navien error code and see what the fault code on your Navien boiler relates to. Navien fault codes are generally the same across all their boilers, which makes it easier to identify the issue with your boiler.
Navien Boiler Error Code Solutions
| Boiler System | Error / Fault Code | Fault Description |
|---|---|---|
| Combi and System | 003 | Ignition failure – manual reset needed |
| Combi and System | 004 | False flame error – the boiler will auto-reset |
| Combi and System | 012 | Flame loss – reset the boiler |
| Combi and System | 016 | Heat exchanger overheated – try manually resetting the boiler |
| Combi and System | 030 | Abnormal exhaust temperature – try manually resetting the boiler |
| Combi and System | 046 | Abnormal operation: Heat exchanger overheating – the boiler should auto-reset |
| Combi and System | 047 | Abnormal operation: Exhaust thermostat error – a manual reset is needed if it the boiler doesn’t auto-reset |
| Combi and System | 060 | Abnormal operation: Dual venturi limit switch – boiler will auto-reset |
| Combi and System | 109 | Abnormal operation: Fan error – the boiler needs resetting |
| Combi and System | 110 | Exhaust blockage (condensate blockage) – reset the boiler |
| Combi and System | 127 | Abnormal operation: Air pressure switch (APS) issue – reset the boiler |
| Combi and System | 205 | Heating supply thermistor open or short circuit – boiler should auto-reset |
| Combi and System | 218 | Alarm error: Heating return thermistor open or short circuit |
| Combi and System | 302 | Low water pressure – boiler should auto-reset |
| Combi and System | 352 | High water pressure – boiler should auto-reset |
| Combi and System | 353 | Abnormal operation: Water pressure sensor error – boiler should auto-reset |
| System | 407 | Abnormal operation: Hot water outlet thermistor – alarm error |
| System | 421 | Abnormal operation: Cold water inlet thermistor Auto reset should automatically occur |
| Combi and System | 480 | Abnormal operation: External domestic hot water (DHW) tank outlet thermistor – alarm error |
| Combi and System | 515 | Abnormal operation: Relay feedback (PCB) – the boiler needs to be reset |
| Combi and System | 517 | Abnormal operation: Dual in-line package (DIP) switch setting (PCB) – boiler needs to be reset |
| Combi and System | 594 | Abnormal operation: EEPROM (PCB) – contact an engineer |
| Combi and System | 615 | Abnormal operation: Input and memory (MCU) – try resetting the boiler |
| Combi and System | 740 | Abnormal operation: Outdoor temperature sensor – boiler should automatically reset |
| Combi and System | 782 | Abnormal operation: Main panel communication – boiler should auto-reset |