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    mikesteen11's Avatar
    mikesteen11 Posts: 1, Reputation: 1
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    #1

    Nov 14, 2010, 07:58 AM
    Our lennox heater will only blow if it is on fan only .It will not work on auto? Why
    I have a lennox elite series heater. The pilot will lit and stay on about 2 min then it shuts off. But if I put the thermostat on fan only it will work but it blows out cold air. Why won't it blow when I put it on Auto?
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #2

    Nov 14, 2010, 09:53 PM

    The Auto position only works when the furnace is producing enough heat to trigger the plemum sensor. The on position ovverides this sensor.
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