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-   -   Air Conditioner very noisy on defrost (https://www.askmehelpdesk.com/showthread.php?t=2142)

  • Jan 5, 2003, 09:05 AM
    tampaken
    Air Conditioner very noisy on defrost
    I have a Carrier 2 1/2 ton heat pump air conditioner. When the heat is on and it goes into the defrost cycle there is a very load humming and/or vibrating sound that last up to 15 seconds. When it comes out of defrost I hear the same sound for about 4 or 5 seconds. Is this normal? I have never heard any of my neighbors AC make this noise. It is so load that it sometimes wakes me up at night.

    Thanks for any help.
  • Mar 4, 2007, 03:22 PM
    hvac1000
    Yes it is normal. Probably the old reversing valve making the noise.

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