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Thread: Blower issue

  1. #1
    Join Date
    Oct 2019
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    Blower issue

    I have a 14 year old American Standard Freedom 90 forced hot air furnace that is acting differently than it has in the past. When the unit first starts up in the morning, the burners ignite and, after a short period of time, the blower motor turns on and hot air comes out of the vents. Within 60 seconds, the blower motor either turns off or cycles down to a very low speed stopping/reducing the normal air flow out of the vents. The burners continue to burn. Within another 60 seconds, the blower motor comes back up to speed resuming normal air flow. This on/off continues until the house is heated.
    I have the unit serviced every 6 months and, for this problem, the tech replaced an internal board and then the blower motor, neither of which solved the problem.

  2. #2
    Join Date
    Jan 2012
    Location
    Broomall, PA
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    Dirty or restrictive air filter?
    If I do a job in 30 minutes it's because I spent 30 years learning how to do that in 30 minutes. You owe me for the years, not the minutes.

  3. #3
    Join Date
    Oct 2019
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    Thread Starter
    New air filter and I think a new capacitor was installed

  4. #4
    Join Date
    Jan 2004
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    PA
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    Is it a single or two stage furnace?
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Aug 2009
    Location
    Beatrice, NE
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    Is this a VS or 4 speed blower?

  6. #6
    Join Date
    Oct 2019
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    Thread Starter
    Single stage

  7. #7
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    Oct 2019
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    Thread Starter
    I believe the original blower was multi-speed but that was replaced with a new blower

  8. #8
    Join Date
    Jan 2004
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    PA
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    If the thermostat is set to fan “on”. Turn it to auto.

    Sounds like it could also be an interrupted heat call.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Oct 2019
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    Thread Starter
    Thermostat always set to Fan-Auto.

  10. #10
    Join Date
    Oct 2019
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    Thread Starter
    With help from a “Mr. Know-It-All” (and I use that term respectfully) friend, my heating problem may have been solved. I tried turning on only the upstairs thermostat and the blower worked fine. Concentrating on the main thermostat, I changed the batteries but the blower still cycled on and off. Before trying a new thermostat, I pulled off the front of the main thermostat to check the wiring. When I snapped the front of the unit back onto the base and turned on the heat everything worked fine. �� I opened the thermostat one more time and tightened each wire connection. The next morning when the heat came on, the blower was back to working as it should.

  11. #11
    Join Date
    Dec 2002
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    Houston,Texas
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    Awesome! have a wonderful weekend, and stay warm...
    __________________________________________________ _______________________
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  12. #12
    Join Date
    Oct 2019
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    Thread Starter
    Grrrrrrr. A little to quick to post a resolution. This morning the furnace started heating continuously for about 10 minutes before the blower began cycling off and on again. Going to try to replace the thermostat to see if that will finally resolve the issue.

  13. #13
    Join Date
    Oct 2019
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    Thread Starter
    Replacement thermostat DID NOT resolve the problem

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