As long as the component senses the flame it sends a message to the main furnace control board telling it to keep the main burner on and the gas valve open.
Lennox furnace flame sensor.
If the flame sensor is defective the furnace may not heat.
Lennox gas furnaces contain an important safety component known as a flame sensor.
Delivering precise comfort and temperature control lennox furnaces can keep your home to within 0 5 degrees of your ideal temperature.
The flame sensor monitors the burner to detect whether or not a flame is present.
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If the flame sensor can t sense the flame because it s too dirty the furnace may shut itself off.
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In the video you can see 4 burner ports.
Pilot light ignites but the flame dies out right away.
Upon removing this screw the sensor will slide out so that you can easily clean it.
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Between the 1st and 2nd burner ports from left to right you can see the wire leading to the flame sensor the sensor is easily accessible and typically mounted by one 1 4 hex head screw.
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