Question about Sub-Zero 650 / O Bottom Freezer Refrigerator

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Sub-Zero Model 550 Ice build-up in the freezer

I have a Sub-Zero 550 and ice builds up in the freezer. Several years ago I had a Sub-Zero approved service company work on it, and they added a heater assembly in the drain tube. This worked for a couplke of years, but the problem came back. Called service again and they found the heater assembly "shorted out" and melted inside the drain tube, so they can't install a new heater assembly since the previous installed one is broken / stuck inside the drain tube. The repair company says they can't do anything else to fix the problem. Since the ice returns about 3-weeks after I fully defrosted the freezer, it is not usable. I can't live with defrosting every 3-4 weeks.

I read somewhere on the internet were someone had the same problem. They solved it by pulling the built-in out from the wall, cut into the side of the freezer to gain access to and replace the drain tube, and then sealed it back up. I am a handy person, but that operation seems a built drastic for me to handle. And I am sure a reputable service company would not take-on such a repair.

Any ideas? I hate the idea, and can't really afford, to replace a $8,000 built-in refrigerator. It is especially upsetting that it is such a simple and low cost problem (meaning it's not as if the expensive compressor's went bad).

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Rotu
  • 175 Answers

SOURCE: refrigerator not cooling top shelf

it sounds as though you have a fridge that is low on freon. If the ice is appearing mostly to the left, then thats surely your problem. if it goes all the way across, you may have a bad evaporater fan motor, fan motor switch, bad cold control, or just a door that isn't closing or sealing properly. If its the ice mostly to the left side, it probably means your evaporater is leaking the freon. I am assuming you have a model that has a cold control on the back wall, not the electronic display by your description. If your unit is less than 12 years old by the installation date, the part will still be under warranty (sub zero has an unmatched 12 year sealed system parts warranty) but the labor and freon will not be. The repalcement of that evaporater in my area usually runs about $450 with labor, freon and trip all together. It is a repair you cannot do unless you have an acetlyn torch and some silver-soldering/ brazing ability. If your model is in fact the newer style with the electronic temp display, call sub zero up (the # is on the model/serial tag in the door jamb) and tell them wahts going on. If it is in fact an evaporater leaking on this style, they will most likely pay the bill for you even if its well out of the 5 year full warranty. If you want to know for sure, remove all the shelves, then remove the cover over the lights. Then if its electronic remove the 3 screws holding the top of the back panel and tilt the panel out to you and pull it up and out: if its a dial type, remove the 2 screws holding the fan cover and then tilt the back wall out to you and lift it up and outwards, but not too far as it wil pull the wires of that control knob (cold Control) Look at the coils back there and see if the coils are frosty. If they are only frosty on the upper left of the coil, its low on freon and needs an evaporater. if its frosty all the way across, top to bottom, you need a cold control, or possibly a fan or fan switch. Hopefuly you can wade through all this. Just post back if you have any questions. Good Luck!

Posted on Aug 16, 2007

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  • 56 Answers

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

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 http://subzero.com/locator/locator.aspx?type=0&zip=Zip%20Code

Posted on Feb 22, 2009

  • 37 Answers

SOURCE: My Sub-Zero drain ices up too!

There is a drain tube heater and a floor pan heater kit for this model from Subzero
This is Not for a DIY project

Affordable Appliance Repair
Lake Forest, CA.92630

Posted on Aug 22, 2009

  • 1274 Answers

SOURCE: I have a Sub Zero fridge about 15 years old. The

try turning the thermostat down a little,..........don,t know what you got it set on ........but water freezes 32 degrees

Posted on Feb 16, 2010

  • 83 Answers

SOURCE: A service rep was out

just a thought sometimes when the defrost has been set you have to go and reset the freezer temp. it should be around zero-f ..... when you reset the freezer temp you should hear it start up. if that dont work call the service company and explain over the phone you need directions to reset or turn it back on.. and tell them if they have to come out you shouldent have to pay because the freezer was working before they came.... and you should have no problems.... the last thing they want is an unhappy customer.. atleast the good companys... good luck i hope this helps

Posted on Aug 13, 2011

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