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Furnace goes on and off

My furnace lights for like 10 seconds and then goes out. Immediatley after it goes out the fan then turns on. I took the sensor out and cleaned it even though it looked good. Is my sensor just bad all together? Any help would be great. Thanks

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  • daniel_robil Dec 26, 2008

    I just replaced the filter recently, the thermostat I can't remember the last time that was changed, and the supply registers are all open.

  • daniel_robil Dec 26, 2008

    Filter was recently replaced (a couple weeks ago), supply registers all open, and I have no idea when the thermostat was or if ever replaced.

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Ok it can be several theings but what you need to look at first tis the Air filter in the return and make sure thAt it is clean. Also have you replacced the thermostat recently? If so make sure that it's configured correctly and setup for gas heat. Also are All of the supply registers opened up in the house. Talke a look at these things first and let us know how it turned out, Thanks for using FixYa

Posted on Dec 26, 2008

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