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I've got a 4 y/o Carrier AC unit that worked fine all summer (bought the house this past winter). Today, I noticed that the house isn't being cooled, and the AC is making a loud buzzing noise. The noise is periodic - roughly ever 3-5 minutes, and lasts for about 5-10 seconds - like something's trying to start and failing. The condenser fan spins the entire time, but appears to do so more slowly than normal, and - no cold.

Could this be a capacitor issue, or should I call in a tech?

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    By continuing to try to run the unit when it is not working properly you could be damaging it. I would call an a/c repair service. Commented Oct 9, 2018 at 11:28
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    @JimStewart never said i kept it running :)
    – kolosy
    Commented Oct 9, 2018 at 23:05

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For posterity - replacing the cap seems to have resolved the issue.

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