Navien
No Heat / Ignition Sequence Not Completing
Navien furnace fan runs but burner does not light and no error code is displayed
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Thermostat not actually calling for heat, Gas supply valve closed, Faulty flame rod or igniter, Control board not initiating ignition
How to Fix / Troubleshooting
Safety: Turn off power and gas before inspecting gas or ignition components. If you smell gas, evacuate and call the gas utility.
- Confirm call for heat: Check the thermostat and Navien display to ensure there is an active heat demand. Replace batteries in the thermostat if needed.
- Verify gas valve position: Ensure the manual gas shutoff to the furnace is fully open.
- Inspect flame rod and igniter: Remove and clean the flame rod, and visually inspect the igniter for cracks. Replace if damaged.
- Check for hidden error codes: Enter service mode (if available) to view any stored fault codes that may not show on the main display.
- Professional diagnosis: If the unit still will not ignite and no code appears, a technician should test the ignition sequence, gas valve operation, and PCB outputs.
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Repair Difficulty
Hard
4/5
Required Part
Ignition Electrode
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