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-   -   Goodman furnace is making loud noise when in cool down mode. (https://www.askmehelpdesk.com/showthread.php?t=413148)

  • Nov 5, 2009, 06:42 PM
    jhughes23
    Goodman furnace is making loud noise when in cool down mode.
    When the furnace fan is running in cool down mode, it sounds as if a flap on the exhaust vent is flapping in the wind
  • Nov 5, 2009, 06:52 PM
    KC13
    Sounds like you may have a clogged condensate trap, and the inducer housing is flooding. Follow the drain tubes from the inducer and secondary heat exchanger to locate the trap. Remove it and flush with water. This should be done every year prior to heating season, in addition to cleaning the flame sensor (consult HVAC1000 on this forum if you need a pic of sensor).
  • Nov 5, 2009, 07:21 PM
    Joshdta

    Where is the noise the loudest, and do you hear it clear upstairs?
  • Nov 5, 2009, 07:25 PM
    KC13
    Quote:

    Originally Posted by Joshdta View Post
    where is the noise the loudest, and do you hear it clear upstairs?

    It gets louder as she gets closer. :D Sorry, couldn't resist...
  • Nov 5, 2009, 08:05 PM
    jhughes23

    It is loud at the unit and it sounds like it is coming from inside the unit above the burners.

    Where is the condensate trap located?
  • Nov 5, 2009, 08:13 PM
    KC13
    You didn't mention a model #, so... most likely located on the outer lower sidewall of the furnace. Usually black plastic with several hose connections and an outlet piped to a floor drain or pump.
  • Nov 5, 2009, 08:14 PM
    jhughes23

    Thanks! Model GMP100-4
  • Nov 5, 2009, 08:19 PM
    Joshdta

    If the trap was that full of water the furnace would probably not fire
  • Nov 5, 2009, 08:22 PM
    KC13
    Ok, I figured it was a GMPN when you mentioned an exhaust vent. GMP's don't have a condensate trap or secondary heat exchanger. How old is the unit? If you can post the serial # that will tell us.
  • Nov 6, 2009, 06:19 AM
    jhughes23

    It is a 2000

    I will look for the serial #

    Thanks
  • Nov 7, 2009, 09:46 AM
    jhughes23

    The model #U-36

    Serial #0009594323
  • Sep 22, 2012, 01:51 PM
    pumaalex49
    Hi I hava a goodman furnace and when in cool mode it makes a loud huming noise. But when the fan is turned on the huming goes away can anyone help me out what is the problem. Also it's a 2012 model it is 2 weeks old.

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