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    RAldean's Avatar
    RAldean Posts: 2, Reputation: 1
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    #1

    Nov 6, 2007, 09:11 PM
    Heat Pump - Blowing hot air from outside compressor & making noise
    My Carrier (M#48GS-003060) heat pump compressor all of a sudden starting making a loud humming noise tonight, when I went to investigate I found the outside unit discharging hot air. Why would it be making the loud humming noise? Is the discharge of hot air related to the noise?
    derobert's Avatar
    derobert Posts: 34, Reputation: 2
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    #2

    Nov 7, 2007, 12:59 AM
    Did it go back to normal in a few minutes and was the fan off? If so, I think you just watched a defrost cycle.
    RAldean's Avatar
    RAldean Posts: 2, Reputation: 1
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    #3

    Nov 7, 2007, 04:37 AM
    No the unit did not shut off - it stayed on. It is 60 degrees outside so I would not think it would need to go through a defrost cycle.
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #4

    Nov 7, 2007, 02:22 PM
    You don't have a heat pump based on the model numbers you posted, this model is a gas electric 2 1/2 ton with 60,000 btu's of heating. The noise may be the compressor or fan motor , it is best to try and determine which is making the noise if possible, it may be the contactor is stuck closed and not allowing it to shut down. Good luck, Mike
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