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HI, I have a Carrier Gas Furnace on my roof. It heats well, but after a heating cycle it sounds as though the inside fan motor is trying to restart. This only lasts for a second each time, but might occur five times right after the unit is done with heating. I am an electrician, and it sounds like someone is "Bumping" the motor. Any ideas? This will happen even if all the thermostat wires are disconnected. Thanks

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  • James Wright Jan 04, 2011

    Hi,
    Thanks for the info. I just have to wait a little bit for the frost to get off the before checking!
    I will let you if if that does it or I can't find it. I have a bit of a worn wiring diagram!
    Thanks,
    JIm

  • James Wright Jan 04, 2011

    Hi, Thanks for the info. I just have to wait a little bit for the frost to get off the before checking! I will let you if if that does it or I can't find it. I have a bit of a worn wiring diagram!



    Thanks,



    Jim

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Hi,
There are two things that can cause that...

The first would be a bad board or relay on the board... the relay is not releasing completely or the board is shorting and causing the relay to bump....

The second would be the high limit bumping and triggering the board to bump the motor...

What I would do is to pull one of the wires from the high limit switch right after it runs and shuts down to see if the problem continues... if it does then the board is bad... if it stops and stays off then the high limit is bad... replace that....

Hope you followed all of this and that it helps you...

heatman101

Posted on Jan 05, 2011

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It sounds to me like your fan off limit switch is set to low if its adjustable or almost worn out if it's not adjustable. I would like to be of more help but I need more information,such as age and size of your furnace and type of limit switch if you know. Thank you.

Posted on Jan 04, 2011

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