Navien Error Code E012: Flame Loss
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.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Navien Error Code 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.
Common Causes
- Faulty ignition system (spark electrode or igniter)
- Obstruction in the combustion chamber
- Problem with the gas valve or gas supply
- Incorrect flame sensor readings
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Boiler won't restart after reset | Gas pressure using a manifold gauge | Between 3.5" to 7.5" W.C. |
| Flame sensor is dirty | Clean the flame sensor using a fine emery cloth or sandpaper | Clean sensor |
Applicable Navien Models
Source Documentation
Referenced in 6 official Navien technical manuals.
| 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
Issued: December 20, 2018
Affected models: NPE-180A, NPE-180S, NCB-180E manufactured July 9 - October 14, 2018
LP gas conversion kits can cause units to produce excessive carbon monoxide.
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Igniter | 400-00014-00 | — | Find Part |
| Gas Valve | 400-00018-00 | — | Find Part |
| Flame Sensor | 400-00015-00 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Navien model families as E012.
| 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 |