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Lennox XC21-048 Flame Sensor
The flame sensor can only be found on furnaces that burn a gas. It is a safety sensor that will dependably sense the precise flame during ignition. As you would probably could have guessed, when the sensor is triggered by an event everything remains shut off until the main issue is remedied.
Simple warnings that your furnace flame sensor is on its last leg?
- The entire heating system runs on certain occasions whenever it pleases
- The gas entering the furnace refuses to ignite and the board throws an error
- The heat system cannot even begin to start and spits out an error code on the main board
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