E2
Frigidaire
Flame Sense Failure / Flame Not Proved
Furnace starts but shuts down quickly; control board displays E2
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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
Contaminated flame sensor, Poor burner ground, Weak flame due to partially blocked burner, Faulty control board flame circuit
How to Fix / Troubleshooting
Safety: Turn off electrical power and gas before opening the furnace cabinet.
- 1. Clean the flame sensor: Remove the burner access panel. Locate the flame sensor (thin metal rod in front of a burner). Remove the mounting screw and gently clean the rod with fine steel wool until shiny. Wipe with a dry cloth and reinstall.
- 2. Check ground connections: Verify the burner rack and gas valve have solid metal-to-metal contact with the furnace chassis. Tighten any loose screws and clean off rust or paint that may prevent grounding.
- 3. Inspect burners: Remove burners if accessible and check for rust, debris, or spider webs in the burner ports. Clean with a soft brush and compressed air. Reinstall ensuring proper alignment with the orifices.
- 4. Verify flame coverage: After reassembly, restore power and gas, then call for heat. Through the sight glass, confirm that flame is steady and fully engulfs the flame sensor.
- 5. Control board check: If the flame is strong and sensor is clean but E2 persists, the integrated furnace control (IFC) flame-sense circuit may be faulty. This requires board replacement and should be done by a licensed technician.
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Repair Difficulty
Hard
4/5
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