Miller
Flame Proving / Sensor Issue
Furnace starts then shuts off after a few seconds without heating the home adequately.
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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, Poor burner ground, Low gas pressure, Faulty control board
How to Fix / Troubleshooting
Safety: Turn off power and gas before removing the flame sensor or burner assembly.
- Clean flame sensor: Remove the sensor and clean the rod with fine abrasive pad. Reinstall firmly.
- Check ground connections: Tighten ground screws on the burner rack and control board.
- Observe flame: Ensure the flame fully engulfs the flame sensor. If not, clean burners and check gas pressure (by a professional).
- Replace sensor or board: If the problem persists, replace the flame sensor. If still unresolved, the control board may need replacement.
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Repair Difficulty
Medium
3/5
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