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Furnace come on then fan stops while burner still is on, then fan comes on for 1 min. and goes off over and over

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This could be a couple of things, first is the fan limit switch. Make sure your fan limit is set at the correct settings, there is a fan on setting and a flame shut off setting located on the front of air handler inside the front cover. Usaully set at 140 fan on 200 gas shut off. You do not say what unit you have so this could be a pc board or module. Second this could be the blower it's self over heating and shutting down, feel if motor is gettig hot. This could be a run cap. or motor it's self. But it is more than likely the limit switch.

Posted on Sep 29, 2008

  • Edward Boukater Oct 01, 2008

    I don't understand how you can sy this is not appropriate I've been on the a/c heating business 30 yrs. Is there some other info. I'm missing.

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Posted on Jan 02, 2017

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Goodman furnace Model GDS80703AXBB -fan comes on then igniter light comes on, then burners turn on but shut off right away and wont stay lit. Now igniter light wont come on so burners not coming on at...


Sounds like either the flame sensor is not working.
The sequence for starting the furnace is:
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1:00 Burner comes on and dial begins to move slowly up.
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4:50 Fan turns off with dial still at 110 deg.
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6:15 Fan on. Dial at 140 deg. Burner is still off.
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Ths is an easy problen to solve. Looking close to the burners is a pilot sensor. It looks like a thin metal pin about 1" 1/2 long. Clean this with sandpaper. This will allow you furnace to stay lit.

Hope this helps,

RepairUSA

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