Navien Error Code E004: False Flame Detection
Warning: Your Navien boiler has detected a potential safety issue and has shut down to prevent any hazards.
How to Fix Navien Code E004
- Step 1: Turn off the boiler and allow it to cool down for at least 30 minutes.
- Step 2: Inspect the flame sensor for any signs of dirt or soot. If present, clean it gently with a wire brush.
- Step 3: If the issue persists, call a professional HVAC technician for further diagnosis and repair.
How to Reset Navien Code E004
- 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 E004 Mean?
The E004 error on your Navien boiler indicates a false flame detection. This means the boiler's sensors have detected an issue with the flame, even though there might not be one. This is a safety feature designed to prevent any potential gas leaks. To resolve this issue, you'll need to troubleshoot and potentially replace some components.
Common Causes
- A dirty flame sensor
- A faulty ignition or flame sensor
- Incorrect gas pressure
- A problem with the boiler's control board
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The boiler is not igniting | The gas valve and ignition system | Both should be functioning correctly |
| The boiler is igniting but the flame sensor is not detecting the flame | The flame sensor's resistance | Between 50-200 ohms |
Applicable Navien Models
Source Documentation
Referenced in 6 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | False Flame | Check electric ground. |
| Navien NCB-H Installation & Operation Manual | 129 | False Flame | Ensure that the electrical cord is properly grounded. |
| Navien NFB-H Installation & Operation Manual | 116 | False Flame | Check electric ground. |
| Navien NFC-H Installation & Operation Manual | 127 | False flame detection | Manual RESET Auto RESET |
| Navien NHB-H Installation & Operation Manual | 119 | False Flame | Check electric ground. |
| Navien NPF Installation & Operation Manual | 125 | False-flame | This error occurs when the flame detector does not operate properly. ● If the furnace is operating properly, this error will be cleared automatically. ● If the furnace is continuously inoperable, contact Technical Support at 1-800-519-8794. |
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Flame Sensor | — | — | — |
| Gas Valve | — | — | — |
| Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Navien model families as E004.
| Code | Description | Severity |
|---|---|---|
| E001 | Ignition Failure | Warning |
| E003 | Abnormal Ignition | Warning |
| E012 | Flame Loss | 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 |