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  1. #1
    Join Date
    Oct 2009
    Location
    Owasso, OK
    Posts
    42

    Transformer on airhandler (Goodman) keeps burning out the primary side.

    I've got this Goodman Heat pump that keeps burning up the primary side of the transformer (240V)... Put a new transformer on it and the next morning I get a call that it's not working again. I've seen them blow the secondary side due to low voltage wiring issues but never run across one that does the primary side..... what am I missing.... all the relays (blower, heating element) look good..... what would cause this to be happening...... Electrician came and checked the incoming power and neutrals said everything looks good said I probably just got a lemon transformer..... Any Ideas??

  2. #2
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,943
    How are you checking it to know that it is the primary side that is burning up?
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  3. #3
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    Is the secondary side fused?
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
    "Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twain
    http://www.campbellmechanical.com

  4. #4
    Join Date
    Jan 2007
    Location
    N.E. Ok.
    Posts
    1,369
    Did you check the defrost circuit for shorts?

  5. #5
    Join Date
    Dec 2012
    Location
    Daphne, AL
    Posts
    60
    I've always heard that when the secondary side is grounded, shorted, etc., it will be the primary side that burns. Make sure to fuse your secondary side, so you can find the short without constantly replacing transformers. I'm going to go do a little more research on the first statement I made. See what I can find out.

  6. #6
    Join Date
    Dec 2012
    Location
    Daphne, AL
    Posts
    60
    Check the archives. There is a long discussion about primary/secondary. It seems to me that what I said above is correct. When the secondary side is over amping, the primary side will be the first to burn. Keep checking the control side for a short or ground. Hopefully it will not be an intermittent ground. Pulled an all nighter on those before.

  7. #7
    Join Date
    Nov 2008
    Location
    baltimore
    Posts
    26
    Yes, a secondary side short can cause primary coil to burn up. Make sure the secondary side has a fuse on it then see what happens. Loose wire, bad contactor, relay could cause this on a unfused transformer.

  8. #8
    Join Date
    May 2011
    Location
    Ripley, WV
    Posts
    1,161
    Also get one of these to help out with when troubleshooting.

    http://fierychill.com/lil-popper-3-a...-products-pop3

  9. #9
    Join Date
    Oct 2009
    Location
    Owasso, OK
    Posts
    42
    No the secondary isn't fused so I'll do that and start tracking the 24 v side

  10. #10
    Join Date
    Oct 2009
    Location
    Owasso, OK
    Posts
    42
    Thanks I'll get one for sure

  11. #11
    Join Date
    Oct 2009
    Location
    Owasso, OK
    Posts
    42
    Thanks.... going to check the defrost...... stayed for about 1hr after starting system with the new transformer and everything was fine so it very well could be in the defrost side.

  12. #12
    Join Date
    Oct 2009
    Location
    Owasso, OK
    Posts
    42
    With a meter checking continuity

  13. #13
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,943
    Quote Originally Posted by captube View Post
    Did you check the defrost circuit for shorts?
    That would be on the secondary side.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


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