Question about Sub-Zero 650 / O Bottom Freezer Refrigerator

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Sub-Zero 550 water dripping on right side of freezer forming ice on draw

I have a Sub-Zero 550 and water is dripping onto the freezer draw and freezing making it hard to open the freezer. It seems like water is leaking out of the tray. How do I fix? How do I get to the tray and drain line to see if it is plugged up? I have the same problem. Technician investigated today and after defrosting the ice build up, figured out that the condensation drain itself was broken. He had never seen this before; the Sub Zero people said there is no fix as the drain is encased in the foam insulation. As the unit is 15+ years old, Sub Zero said we were on our own.

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  • Anonymous Jan 29, 2009

    Water is leaking into the freezer and freezing on the tracks.

    It must be the same issue, My 550 is 21 years old and is a piece of junk!

  • Anonymous Jan 31, 2009

    12 year old subzero. Same problem. Ice forms on right side track, and you could kill yourself while (unsuccessfully) trying to open the freezer.

    Should not happen in an expensive refrigerator like this.



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The drain line has been clogged. There is actually a defrost heater kit for that problem if you can get the obstruction out. Did you call factory at 800-222-7820 or a local factory authorized servicer? The drain is accessed by removing the fan shroud and evaporator cover. There are a number of of phillips head screws that hold this in place. Once you have removed the two cover you will see the drain tube on the left side of the unit. I use a hair dryer to start defrosting the tube. If you have another freezer in the house it is easier just to turn the freeezer section off for a day or so. I use nitrogen to blow the line out from the bottom once everything has defrosted. Test for water flow, then put unit back together. Call the factory at the number above for the heater kit part number and they will also give you the local authorized parts supplier. The locator web address is

Posted on Feb 22, 2009

  • Larry4490 Oct 02, 2010

    Had the same problem. Blew out the line instaled the tube heater kit. Problem solved. Our 550 is older than I can remember and still runs great.



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