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    garden888's Avatar
    garden888 Posts: 4, Reputation: 1
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    #1

    Feb 16, 2009, 03:26 PM
    Furnace keeps cycling
    I have a gas furnace that keeps cycling then kicks out for an hour. This started since the replacement of a fan motor. Warning code is four flashes. Already jumped all sensors that could be affected by this code all was good. Took filter out, cleaned A-coil. Not sure what else to do. :confused:
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Feb 16, 2009, 05:43 PM
    Good start, now fill in the holes (brand/model # of unit, description of fault code 4).
    garden888's Avatar
    garden888 Posts: 4, Reputation: 1
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    #3

    Feb 16, 2009, 05:51 PM
    It's a KeepRite model C8MPNO75B1ZA1 I think the code means open high temperature limit device
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    garden888 Posts: 4, Reputation: 1
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    #4

    Feb 16, 2009, 05:53 PM
    Or maybe it means Limit Switch Open
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #5

    Feb 16, 2009, 05:59 PM
    Was the circulating blower motor replaced? If done improperly (wrong motor, speed, rotation, or improperly installed), the unit may be overheating. How's the airflow now compared to before motor replacement?
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    garden888 Posts: 4, Reputation: 1
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    #6

    Feb 16, 2009, 06:11 PM
    That's all fine. Air flow is good
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    KC13 Posts: 2,556, Reputation: 99
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    #7

    Feb 16, 2009, 06:23 PM
    Why was the previous motor replaced? If it failed and the unit was overheating for a while, this "new" problem may be a "side effect" of that. Have you checked to assure the motor is wired correctly? Does the motor feel unusually hot to the touch?
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