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

    Oct 22, 2011, 05:47 AM
    Bryant plus 90 furnace? ONCORE, the blower keeps coming on!
    I have a bryant plus 90 that was installed in 1989 Model# 398AAW060120D and it works great most of the time. In the morning is usually when this happens. After the furnace has gone through a normal cycle the blower motor ONLY comes on for about 1 minute then shuts off for about 1 minute and repeats this cycle until I shut off the power to the furnace. I have had 3 techs out and have replaced the main board. ANY help? Mike
    Handyman2007's Avatar
    Handyman2007 Posts: 988, Reputation: 73
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    #2

    Oct 22, 2011, 06:31 PM
    There is a thermostat that controls the blower. It could be in the form of a thermocouple, snap disk or some other heat detecting device. Some hot air units will run the fans on and off until the plenum(heat chamber) has cooled off. Two reasons- extract as much heat as possible and cool the until off to a safe temperature.
    I would have the tech come back and check anything that connects to the main board... that does not sound like it is the problem.
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