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    dad_of_four's Avatar
    dad_of_four Posts: 3, Reputation: 1
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    #1

    May 27, 2010, 08:25 AM
    Armstrong Ultra Sx80 A/C burns the transformer
    Tried to run AC for the first time this season (Furnace works fine).
    After looking around, the transformer was definitely burnt.
    Bought a new one, swapped it out (after carefully re-connecting the proper wires), and the AC worked.
    About a day later, transformer burned out again.
    Bought a new one, buddy suggested I install fuses between transformer and the circuit board (Heatcraft 40403001 Cat 70K98). Sure enough, as soon as the compressor is to turn on, the fuse blows. Tried 2 amp, 3 amp, 5 amp, then 30 amp! Finally didn't blow at 30 amps, but transformer got hot.

    After probing around other message boards, it appears the A/C relay is faulty, and drawing too much current. Does this make sense?

    So... Where does one purchase a new main board?
    dad_of_four's Avatar
    dad_of_four Posts: 3, Reputation: 1
    New Member
    		  
    #2

    May 27, 2010, 09:12 AM
    OK, so I found replacement boards online, but the are $188!
    Curiously they are the same at 4 different sites.
    Do I need to know someone to get a wholesale price?

    http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CIB9120C2028 &Category_Code=
    dad_of_four's Avatar
    dad_of_four Posts: 3, Reputation: 1
    New Member
    		  
    #3

    May 27, 2010, 09:12 AM
    OK, so I found replacement boards online, but the are $188!
    Curiously they are the same at 4 different sites.
    Do I need to know someone to get a wholesale price?

    http://americanhvacparts.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CIB9120C2028 &Category_Code=
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