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    copia247's Avatar
    copia247 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Sep 20, 2011, 02:43 PM
    Central AC Unit Hums
    In my attempt to repair my central AC unit, what could possibly be the issue if the central AC unit does not run and all I hear from the outside central AC unit is a "humming" sound? I replaced the fan motor because when I first heard the "humming" sound coming from the outside AC unit I noticed that the fan was very hot to a touch. Rather than continue to replace any other electrical parts, such as the Contactor or Capacitor, would anyone know from his or her knowledge and past experience what might be the problem? Thank You
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #2

    Sep 20, 2011, 05:40 PM
    I would start with the capacitor. It is a dual capacitor, take it to a local heating or electrical shop and get an exact match. Or better yet, have them test it for you. They will most likely do this for free, and if its bad, sell you a new one. If it test good, then we move to the next step. Let me know what you find.
    copia247's Avatar
    copia247 Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Sep 21, 2011, 04:21 AM
    Thank you for your reply. I will try to get to test it by the weekend.
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