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    rlwood's Avatar
    rlwood Posts: 1, Reputation: 1
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    #1

    Oct 2, 2014, 05:54 AM
    HVAC problem
    My outside unit hums even when the unit is not running. I'm afraid it might catch on fire so I shut it off. Any ideas why it hums?
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #2

    Oct 2, 2014, 07:35 AM
    I would turn it back on and have someone turn the breaker off to the furnace. See if the stops the humming. That way you know if it's low voltage or high voltage hum.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #3

    Oct 3, 2014, 08:47 PM
    bitters... WHAT??
    The humming will stop whether it's low voltage or high voltage. Your response is inaccurate.
    bitters's Avatar
    bitters Posts: 348, Reputation: 12
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    #4

    Oct 4, 2014, 10:03 AM
    Missouri, you are right about the voltage. Thanks for the correction. The poster said the unit hums even when it is off, which makes me think that the contactor is still energized. The compressor might have went off on overloads because the fan stopped working.
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