Question about Sub-Zero 650 / O Bottom Freezer Refrigerator

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Sub-Zero 550 water leak and freezing

I am getting an ice buildup behind the vegetable and fruit draws with water leakage running out above the bottom freezer door. Behind the produce draws, on the back of the refrig. are 2 angled down tracks meant to catch water and direct it to a small ribbed plastic tube that seems to extend to the floor pan. Recently after chipping away the ice in the refrig, I noticed that that tube was frozen solid. I poured hot water throught it until it was opened and I didn't have the problem for a few days. Then the situation reoccured. Obviously, the water is condensing in the track and because the tube is frozen the water is overflowing and freezing. Doors seal fine. Can you help?

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  • Anonymous Nov 24, 2007

    Have water in bottom of fridge. Hve repeatedly snaked and flushed drain. Lasts about two weeks. Worst aplliance I have ever owned!!! (Came with house) Repairman said drain heater was not the answer.

  • lesfcamp Dec 02, 2007

    I have the same problem with the ice build up. I have spent a ton of money on this unit. 550 model. My unit is 10 years old. I have bought a new coil, new dial to adjust the temp. Also installed this heater for the bottom part of fridge. I still have ice build up. Any help would be appreciated.

  • Anonymous Dec 10, 2007

    I have the same trouble with drain freeze up. I thaw periodically with a hair dryer, etc. It's a project. Seems if fridge temp is lower, there's more time between "hair dryer" remedy. (model 550) I'll look for the tube heater...

  • joyceking Dec 12, 2007

    I have the identical problem. About a year ago I had the drain tube completely replaced and the problem recurred immediately. I have to add that the bottom of my refrigerator is extremely cold. I have to line my fruit and veggie drawers with insulation to keep the items inside from freezing (some still do) while the top of the refrigerator, where I keep my milk, is at about 45 to 50 degrees. I can't raise the temperture setting otherwise everything near the top of the unit will spoil. I think the problem is that there is too little air circulation inside so all the cold air settles to the bottom and freezes the drain pipe. Adding a drain heater might fix part of the problem not the high temperatures at the top. 

  • bww1977 Apr 20, 2009

    I have the same problem, didn't have it for the first 8 years. Ran the copper wire and it took awhile, but a year later the ice is massive and tube frozen. Not sure how logn it has been building up. No gunkin the tube. Has anyone replaced the evaporator? Could this be a problem?

  • Anonymous Mar 22, 2014

    WATER COLLECTING ON FLOOR. I DON'T SEE A DRIP PAN UNDERNEATH FRIDGE. CONDENSATION TUBE IS NOT CLOGGED. IS DRIP PAN FOR SUB-ZERO ON TOP OF UNIT?

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Omg I have this problem too...continually thawing the drain tube and I was going to replace the heat tube..rust too where is pours over the vegetable drawer-

Posted on Aug 30, 2014

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Same problem. had a coil installed about a year ago and it worked for a while. now, the problem is back :0 I guess I will have to put a reminder on the calendar to use a hair dryer every couple of weeks and NOT put veggies in the veggie drawer. Maybe Juice boxes?

Posted on Jan 21, 2011

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I think the tube is clogged with gunk.  Had the same problem and it recurs every 2-3 years.  Blow the tube out with compressed air. from inside the refrigerator at the drain port.  Insert the air compressor wand in the port and blow in the compressed air.

Posted on Oct 28, 2007

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Seems to be a common problem with these units. You can get a drain tube heater ( got mine from an online refrigerator parts distributor), though may not totally solve problem. Some suggest running a copper wire through tube - supposed to conduct just enough heat to keep tube from freezing.

Posted on Sep 11, 2007

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