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Hi my miller gas furance burner comes on but the fan does not come on , then the burner goes off soon after ward. any idea's ?

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Sounds like the fan motor maybe bad. take the fan door off and see if you can spin the fan. if not the motor will need to be replaced. if it does turn you will need a volt meter to test the input voltage.jumper the fan door switch and lite off the furnace.with the volt meter on the high speed wire you should see voltage in about 60/90 sec. if you have voltage once again the fan motor is bad. if no voltage your furnace is cycling off on your t-stat or your board is bad.

Posted on Mar 23, 2011

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1:00 Burner comes on and dial begins to move slowly up.
2:30 Dial at 140 deg and fan motor comes on. Dial never goes above 150 deg.
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5:30 Burner off. Dial at 120 deg.
6:15 Fan on. Dial at 140 deg. Burner is still off.
7:00 Burner on. Dial at 120 deg.
7:40 Burner off. Dial still at 120 deg.
8:30 Fan off with dial at 110 deg., and it quickly snaps back to the 80 deg. position.
8:30 plus, cycle continues.....

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