Navien Error Code E012
Flame Loss During Operation
What Does E012 Mean?
Error code E012 indicates that the flame was detected during ignition but was then lost during the heating operation. The flame sensor detected the loss of flame and shut down the system as a safety precaution.
This is a safety lockout that prevents unsafe operation and potential gas buildup. The system will not restart until the underlying issue is resolved and the error is cleared.
Common Causes of E012
Immediate Steps
Check Gas Supply
Verify that the gas shut-off valve is fully open and other gas appliances in your home are working properly.
Inspect Venting
Check the exhaust vent termination outside for blockages, ice, snow, or debris. Clear any visible obstructions.
Do NOT Attempt Multiple Resets
Do not repeatedly attempt to restart the boiler. Flame loss errors indicate a potentially dangerous condition that requires professional diagnosis.
Call a Professional
E012 requires professional diagnosis and repair. Contact a licensed HVAC technician immediately for safe resolution.
Why Professional Service is Essential
Safety First
Flame loss during operation can indicate gas supply, venting, or combustion issues that pose safety risks if not properly diagnosed and repaired.
Specialized Equipment Required
Properly diagnosing E012 requires gas pressure testing, combustion analysis, and potentially specialized sensor testing equipment.
Warranty Protection
DIY repairs may void your Navien warranty. Professional service ensures proper repairs while maintaining warranty coverage.
What Our Technicians Will Do
Test gas supply pressure and verify proper gas valve operation
Inspect and test the venting system for proper airflow and termination
Clean and test the flame sensor and associated wiring
Perform combustion analysis and adjust air/gas mixture if needed
Inspect the burner and heat exchanger for carbon buildup or damage
Test the system through multiple heating cycles to ensure stable operation
• Schedule annual professional maintenance to keep combustion components clean
• Keep exterior vent terminations clear of snow, ice, and debris year-round
• Monitor your gas supply and report any irregularities to your gas provider
• Address any unusual sounds or performance issues promptly
Related Navien Error Codes
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