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    hvactothemost's Avatar
    hvactothemost Posts: 1, Reputation: 1
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    #1

    Nov 14, 2011, 10:04 PM
    I have a American standard 90 plus furnace that will not light.
    I have changed the draft motor I'm not getting any suction to pull in the pressure switch could it be the heat exchanger. If I suck in the pressure switch it lights up.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
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    #2

    Nov 20, 2011, 10:02 AM
    It could be the heat exchanger and they have a 20-year warranty most of the time. It would be rare. It also could be in the draft switch being out of calibration or the motor turning in the wrong direction. The fan rotates in the direction the blades point. Did you get an exact replacement or a generic? The wrong rotation is highest on probability. DrTom4444
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