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Lennox Flame Sensor 40L81
This part 40L81 is compatible with:
- Product Type:
- Furnace
- Brands:
- Lennox
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Flame Sensor Customer Reviews
Common Problems Fixed by the Flame Sensor
Based on customer reports and repair data, this part commonly fixes these issues:
About the Flame Sensor
The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the control board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.
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