Question about Sub-Zero 690 Side by Side Refrigerator

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Sub-Zero 590 The refrigerator portion of my SZ 590 will not get colder than 46 degrees. I have removed the back panel behind the food shelves and see that the top-left corner of the coils was all ice. The ice covered an area about 5" x 5". I turned the fridge off for a few hours to let all the ice melt away. After turning the fridge back on, the ice returned within an hour. Is this from excess humidity in the fridge? Might this go away on its own once I put the back panel on? The fan inside the fridge (on the top pointing down) comes on when the door is closed. Can someone take a stab at what the issue might be? The unit is 13 years old.

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  • brokenrubber Jul 21, 2017

    YOUR FRIDGE EVAP IS LEAKING PART WAS 12 YEAR WARRANTY CALL SUB YOU MAY GET LUCKY AND THE WILL STILL COVER PARTS

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  • Sub-Zero Master
  • 2,594 Answers

Ignore the fan operation... That is perfect.

You are likely experiencing a DEFROST failure
(most commonly a defrost timer failure)...
part number 3081180 item 69 on your exploded
top view (top right side as viewed from the front).

There are typically only three (3) elements to a DEFROST
circuit:
- Defrost Timer (as noted above)

- Heater element to WARM the EVAPORATOR

- DEFROST thermostat... inhibit excess heat
(closed circuit at freezing - Opens at room temperature)

Check your defrost pan...
there should be water there DAILY...

IF not: you are assured that your DEFROST fails.

Per YOUR DESCRIPTION...
You need to look for a SUDDEN REASON (huge air leak)
why FROST would form so quickly...
USUALLY a big pizza box... BUT ANYTHING blocking a
TIGHT DOOR SEAL will cause massive frosting.

It is taking moisture from the WARM ROOM AIR and blocking your evaporator...

Yes ... all INTERIOR panels must be in place for the refrigerator to function properly.

guaranteedparts.com http://www.guaranteedparts.com/picture_library/Subzero/Subzero-500%20Series/590.pdf

Sears
http://www.searspartsdirect.com/refrigerator-repair/symptom/REF0003.html

Carnac the Magnificent

Posted on Apr 06, 2017

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  • 56 Answers

SOURCE: Sub-zero Fridge not cooling and ice forming

You do have a leak and it will be in the evaporator. So call a factory authorized company and have it replaced.The warranty of a Sub Zero sealed system is full parts and labor for years 1-5 and parts only in year 6-12. Sub Zero expects a lot of their service companies so it behooves you to call one. To find an authorized company go to http://www.subzero.com/locator/locator.aspx?type=0&zip= or call 800-222-7820

Posted on Jan 08, 2009

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