Navien Error Code E012: Flame Loss
Warning: Your Navien boiler has experienced a flame loss, which could lead to system damage if not addressed promptly. It's safe to troubleshoot, but call a professional if needed.
How to Fix Navien Code E012
- Check if the reset button (if present) has tripped. Press it once to reset the boiler.
- Ensure the boiler's power switch is ON and the boiler is in heating mode.
- Inspect the gas supply valve to ensure it's open and gas is flowing.
How to Reset Navien Code E012
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
What does E012 mean?
The E012 error on your Navien boiler indicates a flame loss issue. This could be due to a problem with the ignition system, a blockage in the combustion chamber, or an issue with the gas valve. The boiler will display this error and shut down to prevent further damage. While it's safe to check a few things, do not attempt to open the boiler or tamper with gas lines.
Affected Models
- NCB-H
- NFB-H
- NFC-H
- NHB-H
- NHW-A
- NPE-A2
- NCB
- NCB
- NCB
- NPE
- NPE
- NPE
- NHB
- NHB
- NCB
- NCB
- NPE
- NPE
- NCB
- NCB
- NPE
- NCB
- NPE
- NHB
- NCB
- NPE
- NPE
- NCB
- NCB
- NPE
- NPE
- NPE
- NPE
- NHB
- NHB
- NCB
- NCB
- NPE
- NPE
- NBP
- NPE
- NPE
- NPE
- NFC
- NFC
- NCB
- NPE
- NPE
- NPE
- NCB
- NPE
- NCB
- NPE
- NPE
- NCB
- NPE
- NHB
- NPE-S
- NPN
- NPN
- NCB
- NPE
- NCB
- NPE
- NHB
- NPB
- NFC
- NFC
- NHB
- NPF
- NPF
- NPE
- NHB
Source Documentation
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | Flame Loss | Check gas, venting and condensate trap. |
| Navien NCB-H Installation & Operation Manual | 129 | Flame Loss | ● Clean the intake air filter. ● Ensure that the electrical cord is properly grounded. |
| Navien NFB-H Installation & Operation Manual | 116 | Flame Loss | Check gas, venting and condensate trap. |
| Navien NFC-H Installation & Operation Manual | 127 | Flame loss | Manual RESET |
| Navien NHB-H Installation & Operation Manual | 119 | Flame Loss | Check gas, venting and condensate trap. |
| Navien NPF Installation & Operation Manual | 125 | Flame loss during combustion | This error occurs when the flame detector does not operate properly. ● Check if the supply and exhaust pipes connected to the furnace are installed properly. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794. |
Recall Notices
Navien Tankless Water Heaters and Combination Boilers Recalled Due to Carbon Monoxide Hazard
19-027
LP gas conversion kits can cause units to produce excessive carbon monoxide.
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Igniter | 400-00014-00 | — |
| Gas Valve | 400-00018-00 | — |
| Flame Sensor | 400-00015-00 | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| E001 | Ignition Failure | Warning |
| E003 | Abnormal Ignition | Warning |
| E004 | False Flame Detection | Warning |
| E016 | Overheating | Warning |
| E030 | Exhaust Overheat Sensor | Warning |
| E031 | Inlet Thermistor Open/Short | Warning |
| E046 | Outlet Thermistor Open/Short | Warning |
| E047 | DHW Thermistor Open/Short | Warning |
| E060 | Fan Motor Abnormality | Warning |
| E109 | Fan Motor Speed Low | Warning |