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    PhilipG's Avatar
    PhilipG Posts: 5, Reputation: 2
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    #1

    Jul 29, 2010, 09:07 AM
    Ac works fine, but compressor fan not turning back on after it cycles off once
    Having a problem with my ac compressor fan. Unit starts fine and produces nice cool air. Problem comes when it reaches thermostat temp after a few hours and it cycles off. When the temp rises a few degress and tries to cycle back on, the compressor fan won't turn and it makes a humming noise like it is trying to but can't.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jul 29, 2010, 09:24 AM

    Possible capicitor

    When it tries but want start, turn off the power,spin fan blade with a stick,does it seem to be kind of stiff hard to turn ? Or does it spin freely?
    PhilipG's Avatar
    PhilipG Posts: 5, Reputation: 2
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    #3

    Jul 29, 2010, 09:30 AM

    The blades seem to spin fine. In fact, if I turn it off for an hour and let it cool down, it will start back up fine and work for a few hours again until it cycle off. When it tries to start back up, same thing.
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    PhilipG Posts: 5, Reputation: 2
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    #4

    Jul 29, 2010, 09:38 AM

    Also, my current heating/cooling guy is trying to tell me that he thinks the freon is corrupted with water or air and should be vacuumed out and replaced ($900 or so... ). That doesn't sit right with me. Don't see how a freon issue would effect the compressor fan. Oh, and thanks for the reply.
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    wmproop Posts: 3,749, Reputation: 91
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    #5

    Jul 29, 2010, 10:08 AM

    Quote:::work for a few hours again until it cycle off

    Does it run that long before it satisfies the tstat and turns off?
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    PhilipG Posts: 5, Reputation: 2
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    #6

    Jul 29, 2010, 10:26 AM
    Not always. Since we've been having this problem I've been using it sparingly. The thermostat for the second & third floors is, unfortunately, located on the third floor (converted attic) which gets rather hot. I've been keeping it off during the day and turning it on a hour before the kids go to bed as I can't trust it to make it through the an exteded period without the fan shutting off. When it was working properly, no, I don't think it took that long and it would cycle on/off for far shorter periods.
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    PhilipG Posts: 5, Reputation: 2
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    #7

    Aug 4, 2010, 11:58 AM

    Just a bit more detail if anyone is listening. Managed to catch the fan right as it was trying to restart. Would turn about a quarter revolution and stop. When I tried to push the fan, there was quite a bit of resistance. Once I turned the a/c off, the fan spun freely. Thinking this must mean it is not the capacitor and is probably the fan motor or the bearings inside...
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #8

    Aug 4, 2010, 12:22 PM

    Probably a good thought
    Keep in mind when you get a new motor ,it will need a new capicitor that matches the motor,its just a small one that is for the new motor only,leave the bigger duel cap for the compressor to run on
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