Navien Error Code E003: Abnormal Ignition
Warning: Your Navien boiler has encountered an abnormal ignition issue and has shut down to prevent damage. Call a professional for repair.
How to Fix Navien Code E003
- Step 1: Turn off the boiler's power supply at the circuit breaker.
- Step 2: Check if the reset button (if present) on the boiler has been activated. If so, try pressing it once to reset the boiler.
- Step 3: Call a professional HVAC technician for a thorough inspection and repair.
How to Reset Navien Code E003
- 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 E003 Mean?
The E003 error on your Navien boiler indicates that the ignition system isn't functioning as it should. This could be due to a few reasons, but it's important to note that attempting to fix this issue yourself could lead to further damage or safety risks. Always consult a professional HVAC technician for repairs.
Common Causes
- Faulty ignition rod or sensor
- Clogged or dirty burner
- Incorrect gas pressure
- Failed control board
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Boiler won't ignite at all | Measure the resistance of the ignition rod using a multimeter. It should be within the manufacturer's specified range (usually between 10-15 kΩ). | Within specified range |
| Boiler ignites but flame goes out quickly | Inspect the burner for any signs of clogging or dirt. Also, check the gas pressure using a manometer. It should be around 7 inches W.C. | Clean burner, gas pressure around 7 inches W.C. |
Applicable Navien Models
Source Documentation
Referenced in 6 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | Ignition Failure | Check gas supply valve and igniter. |
| Navien NCB-H Installation & Operation Manual | 129 | Ignition Failure | Ensure that the main gas supply valve is open. |
| Navien NFB-H Installation & Operation Manual | 116 | Ignition Failure | Check gas supply valve and igniter. |
| Navien NFC-H Installation & Operation Manual | 127 | Ignition failure | Manual RESET |
| Navien NHB-H Installation & Operation Manual | 119 | Ignition Failure | Check gas supply valve and igniter. |
| Navien NPF Installation & Operation Manual | 125 | Ignition failure Clogged vents | This error occurs when ignition fails or is not detected due to a flame not being detected. ● Check if the main gas supply is open. ● Check if the exhaust duct is blocked or damaged. ● Check if the condensate drain is clogged. ● Check the amount of remaining propane gas in the gas tank. If necessary, replace it with a new gas tank. ● 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 Active
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 |
|---|---|---|---|
| Ignition Rod | — | — | — |
| Control Board | — | — | — |
Related Codes on Same Models
Other codes that affect the same Navien model families as E003.
| Code | Description | Severity |
|---|---|---|
| E001 | Ignition Failure | Warning |
| E004 | False Flame Detection | 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 |