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HOW TO FIX ERROR CODE E003



Error Code E003

EC45 or Error Code 45


Navien error code 003 indicates an ignition failure.



1. Check Gas and Power:

  • Gas Supply: Verify the gas supply valve is fully open and that the gas cylinder (if applicable) is not empty. 

  • Power: Ensure the unit is properly connected to a power source. 

2. Inspect the Ignition System:

  • Igniter and Flame Sensor: Look for any signs of damage or wear on the igniter and flame sensor. These components may need cleaning or replacement. 

  • Air Intake Filter: A clogged air intake filter can restrict airflow, preventing ignition. Clean or replace the filter if needed. 

  • Wiring: Check the wiring connections to the flame sensor and igniter. 

3. Check Venting:

  • Blocked Vent: Ensure the venting system is not blocked or obstructed, as this can also cause ignition failure. 

4. Potential Repairs:

  • Flame Rod Assembly: Replacing the flame rod/igniter assembly may be necessary. 

  • Gas Pressure: Verify the gas pressure is within the correct range for the unit, especially if multiple fixtures are drawing hot water. 

  • Control Board: In some cases, the control board may need to be replaced. 


 
 
 

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