Lennox gas furnaces contain an important safety component known as a flame sensor.
Clean flame sensor lennox gas furnace.
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Remember you are not sanding down an auto body but simply ridding the sensor of any build up it may have.
Once you have removed the sensor gently rub the metal rod only with soft steel wool or soft scotch brie type pad never use sandpaper as it will damage the flame rod.
I noticed that the flame would come on then go out after a few minutes then light then go out after another 3 4 minutes.
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Cleaning the flame sensor with sandpaper can make it more difficult for the component to successfully sense the flame.
Do you plan on doing the work yourself.
I have all the gas shut off thermostat off and power off to the furnace.
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.
Anything else we should know to help you best.
After 3 tries the.