Question about Sub-Zero Bottom Freezer Refrigerator

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Sub-Zero 650 freezer (bottom) too cold. Tried to

Sub-Zero 650 freezer (bottom) too cold. Tried to adjust warmer but keeps heading down to -14 to -20 deg. F

Posted by trabucco on


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Probably bad control board. check this. push the on/of key. the whole ref and freezer nedd to stop. if you hear the compressor in the upper part of the unit or the fan. your contol board need replace.

Posted on Apr 01, 2010



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My freezer temperature read minus 19 degrees and the compressor ran continuously. I bought a new controller board from Sub-Zero's distributor ($250) that fixed the problem. Being an engineer I troubleshot the failed board. The relay driver IC, Part # ULQ2003A, had failed keeping the relay that turns on the compressor activated. The part is available from Digi Key for 61 cents. What a shame to throw away a complex circuit board due to a cheap part failing.

Posted on Mar 15, 2013

  • Lars Petersen Jul 31, 2013

    What model of Sub Zero do you have? I have the same problem and would love to avoid buying a new control board.



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