E3
Miller
Flame Loss During Run
Miller furnace digital display shows E3; burners light then shut off quickly.
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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
Dirty flame sensor, Intermittent gas valve, Poor grounding, Combustion air issues
How to Fix / Troubleshooting
Safety: Turn off power and gas before servicing. Flame loss can cause repeated ignition cycles.
- Clean flame sensor: Remove and clean the sensor rod with fine abrasive pad. Reinstall securely.
- Inspect gas valve wiring: Ensure tight connections and no intermittent shorts.
- Check combustion air: Verify intake air openings are not blocked and the furnace has adequate ventilation.
- Replace gas valve or board: If flame drops out despite good sensor and gas supply, a technician should test and replace the gas valve or control board as needed.
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Repair Difficulty
Hard
4/5
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