In the video you can see 4 burner ports.
Lennox furnace flame sensor.
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Lennox furnace flame sensor.
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.
If the flame sensor can t sense the flame because it s too dirty the furnace may shut itself off.
Lennox gas furnaces contain an important safety component known as a flame sensor.
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The flame sensor monitors the burner to detect whether or not a flame is present.
Flame sensor replacement for lennox furnace flame sensor replaces 52w2901 lb 74940a 31l71 31l7101 fits for g40 g41 g50 g51 g60 g61 g71 52w29 3 8 out of 5 stars 7 6 58 6.
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.
If the flame sensor is defective the furnace may not heat.
Lennox gas and oil furnaces are engineered to deliver perfect warmth efficiency and energy savings.
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As quiet as they are efficient lennox furnaces also startup and run perfectly quietly helping to preserve the peace and quiet of your home.