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    DIY challenged's Avatar
    DIY challenged Posts: 1, Reputation: 1
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    #1

    Dec 24, 2007, 10:04 AM
    Heat Pump start up noise
    My Goodman Heat Pump since new has made a loud hum or cycling noise outside from the compressor unit. This noise lasts about 10-20 seconds and then stops. It also makes this same noise when the units shuts off. Could possibly be a valve or something not opening or closing properly??
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #2

    Dec 24, 2007, 01:44 PM
    Since new? How new is it?
    Does this only do this in the heat pump mode?
    Does it do this in the A/C mode?
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    AC Doc Posts: 12, Reputation: 1
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    #3

    Dec 24, 2007, 07:19 PM
    Is it a two stage unit. Can you get the model number?
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    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Dec 25, 2007, 05:07 PM
    It could very well be a reversing valve noise. A fan motor can also make a similar noise if the capacitor is defective. Sounds and noises are extremely difficult to diagnosis when at the unit let alone trying to guess on the from a question on the board.

    Your model also indicates you have a scroll compressor. While they are good compressors they can make noise during start up and shut down.

    Try to listen a bit more intently to the unit and see if you can narrow it down.
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