Question about Sub-Zero 650 / O Bottom Freezer Refrigerator

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Drain tube blockage other than ice?

As others have noted here, a blocked drain tube causes water to collect below the crisper. I poked a chopstick down the drain tube and encountered no resistance, so I concluded it was blocked with mold or the like. Is this likely?
Thanks, Gary

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  • signu Jul 21, 2008

    same problem with our subzero 650 if you don't check underneath crisper you encounter a flood. I had a service call and he adjusted doors and claimed nothing was wrong and charged $150 very frustrating problem i poked around and tube seems clear

  • Lynda2 Aug 04, 2008

    I've spent over $2,000. trying to get this problem fixed. One repairman suggested I put a heater in to keep the water flowing! Imagine that! I guess I should have done it since I've still got the problem and it's getting worse. I have to defrost the ice buildup under the crispers and on the floor of the freezer every week. Unforturately I can't afford a new frig at this time so I'm stuck with this lemon.

    Lynda

    lyndapetroni@yahoo.com

  • elaine6451 Sep 12, 2008

    I have same problem...water collecting under crisper, but the drain tube doesn't seem to be blocked. Where can it be coming from?

  • jimnche Sep 15, 2008

    ice builds up below the crisper on the left hand side of the fridge. I scrape it off and it builds up again. Is there a drainage problem with the automatic defrosting?



  • Anonymous Sep 20, 2008

    subzero 650 freezer will not defrost.

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1 Answer

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Because your model has an evaporator located inside the fresh food compartment it also will have a drain opening below that evaporator. This is a common problem with these dual evaporator models that have drain blockage caused by ice or gunk blocking the drain and causing water to flow below the crisper drawers. Sea Breeze

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Hi David
In the freezer compartment - under the panel where the water / ice is collecting - towards the back - is a small pan. The pan collects the water when the defroster cycles on to melt ice & frost that collects on the cold coil behind the back wall panel. The pan has an opening with a small tube connected that allows the water to drain out to the larger pan on the floor under the fridge.
If the tube is clogged, the water will not drain and will eventually freeze. Every time the defrost comes on, some of this water will collect under the panel and drip into the fridge compartment if the drain remains frozen.
You will need to clear any obstruction in the drain tube with a short, flexible snake. Access it from the freezer compartment. Remove any built up ice and make sure the pan has not been bent or damaged in such a way that it will no longer allow the water to get to the drain tube. If the tube is clogged due to ice, you will have to thaw it out first. Squirt hot water down the tube to do this quickly - I used a turkey baster and towels in the freezer with excellent results. After the ice has been cleared - use the snake to make sure the tube is open. Replace / repair parts as needed.
After clearing, pour some water down the tube to check for flow. If flowing, empty the drain pan on the floor under the fridge. Next, mix up about 6 to 8 ounces of a 10% bleach + 90% water solution to pour into the drain you cleared. This will kill any biological (mold, etc.) blockage in the tube. Empty the drain pan on the floor under the fridge again - but be extra careful as it has bleach in it.
My fridge did this to me several times before I figured out that ice was blocking my drain. I got a piece of #10 copper wire - long enough to hang from something above (coil, heater, etc.) in the coil compartment down about 4 - 6 inches into the drain tube. Doing this allows the warm air from the heated space during defrost cycles to be conducted down the copper wire into the drain tube - making it it impossible to freeze up. It works perfectly! I recommend a #12 or 10 copper wire, but aluminum works well too. I'd stay away from steel or anything that can corrode - because it will.
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