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My Lennox Furnace starts and stops.

It starts for about 2 seconds, then starts again for about 2 seconds, then shuts off. After about the 3rd time it tries to start, the furnace makes a thump sound and blower kicks in and runs for about 15-20 seconds and then completely stops.

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  • meetoo7k Jan 11, 2009







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    My Lennox Furnace starts and stops.

    It is less then 2 years old.


    It starts for about 2 seconds stops, then starts again for
    about 2 seconds then stops, then shuts off. After about the 3rd time it tries
    to start, the furnace makes a thump sound and blower kicks in and runs for
    about 15-20 seconds and then completely stops.




  • minitrucker1 Mar 31, 2009

    my lennox furnace will kick on and off without ever suppling heat and has been doin it for 2 days

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First let me thank all the pros that take the time to answer our questions. My wife thinks I'm a genious. I had the same problem up to 30 minutes ago and fixed it from a solution found on a different webpage. There's sensor sticking up where the flames come out with a single wire coming from it. Remove the sensor and scrub it with steel wool. Replace it and get your hummer from the old lady because you just saved her a few hundred bucks.

Posted on Jan 17, 2012

  • Max the Vizsla
    Max the Vizsla Jan 17, 2012

    Just don't confuse the sensor to the igniter, which is also in the way of the flames but has 2 wires.

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  • 355 Answers

The reason why it stops and starts is that the sensor within the burner can not sense a flame in the furnace. The parts need to checked is the fuel filter, Air in the line, burnt out arcing rods or a bad ac high voltage transformer.

Posted on Nov 30, 2008

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