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  1. #1
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    transformer on 10k unit blows fuse on hp call



    Hi everybody!
    had a customer that keeps blowing xfmr fuse, I am new too hvac side(refrigeration tech commmercial) its gotta be outside at the hp but not sure how to test the defrost board, it was dark and a long day, emergency heat works fine, and I dont get any voltage off the compressor wire(removed themostat) postive or red wire is 28v .
    I do not remember specs of hp but not important, tested yellow or compressor wire and no voltage so I know it either the defrost control board or the contact.
    this is a new system I did not install but it only maybe 6 months old
    ANY IDEAS???



  2. #2
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    Re: transformer on 10k unit blows fuse on hp call

    i tried to jumper fuse to get a amp draw and it torched the xfmr in seconds

  3. #3
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: transformer on 10k unit blows fuse on hp call

    Follow the short.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

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