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  1. #1

    AC unit will not turn on.

    Very new to this, please help. Need help with the outside AC unit that will not turn on for some reason. It is a Carrier residential product. I have tracked down the problem to it because the thermostat is turning the system on as a whole, the air is blowing from the furnace like it should be. The motor in the outside unit is making a buzzing noise and is heating up tremendously. My first immature guess is that its the motor that might need to be changed. But are there any other things that I can check before calling an HVAC guy and spending hundreds for something I can maybe do myself. If I have to change the motor it's pretty self explanatory I presume?

  2. #2
    Join Date
    Dec 2005
    Location
    Cincinnati, Oh
    Posts
    4,928
    Quote Originally Posted by eurrofreak View Post
    If I have to change the motor it's pretty self explanatory I presume?
    Not at all.

    There's also other parts that can go wrong, that would produce the same result.

    Check the breakers. Then check the yellow pages.

    NO DIY.
    "Better tell the sandman to stay away, because we're gonna be workin on this one all night."

    "Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."

    "Just get it done son."

    Dad adjusted

  3. #3
    The breakers are fine, power is definitely getting there, something is clicking and the motor is humming and heating up like crazy. But you think no DIY for sure? I am very mechanically inclined and an auto tech.

  4. #4
    Join Date
    Jun 2011
    Location
    Hammond,La.
    Posts
    1,176
    Quote Originally Posted by eurrofreak View Post
    The breakers are fine, power is definitely getting there, something is clicking and the motor is humming and heating up like crazy. But you think no DIY for sure? I am very mechanically inclined and an auto tech.
    He means we aren't allowed to give DIY advice. The rules will explain why.

    The motor could be bad and as simple as changing it out with a correct replacement. It could be some other part of the electrical system within the condenser not giving the motor what it needs to run. All of this will need to be checked before replacing the motor. If it is the motor there are a few things that should be checked to determine if something caused the motor to fail other than just being worn out.

    When you say motor I am assuming you are talking about the condenser fan motor and not the compressor.
    "I am for doing good to the poor, but I differ in opinion of the means. I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it."
    Benjamin Franklin, 1766

  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,927
    A smart auto guy could probably find the problem with some help, but as stated, we can't offer that degree of guidance here, because this is an open, searchable database. Someone not as used to mechanical work might find the info and try to use it, with disastrous result.

    If a motor is getting hot, turn the system off and get your AC guy out there. It could save you money. Good luck.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  6. #6
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    Which motor is humming and not running. The condensor fan motor on top of the unit, or the compressor inside the unit. Each has different starting components.

    Do a little wiki search and learn a little more about the units.

    If you can read and electrical diagram and use a mutimeter safely, you might be able to troubleshoot it further yourself.


    The fact that your asking questions on here, probably means you need to call a pro.

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