Diagrams here :
http://www.searspartsdirect.com/partsdirect/part-model/Sub-zero-Parts/Refrigerator-Parts/Model-2811/3054/0161000?searchedModel=2811&blt=05
These are the best I can Do with the Diagrams but I can explane what is going on, and possible soloutions.
Your defrost drain is mostlikeley frozen. This is located on the right hand side, just inside the metal cover. When you remove the meteal cover (((evaperator cover or water pan))) you will see the hole on the right.
Since this is cloged then the water stays in the cover or pan and freezes after the defost cycle.
after you remove the cover you will see the evaperator (( aluminum tubing with fins))) and the heater ((( Black Rod )))
When your machine gose into defrost about every 8 hrs, this heater melts the ice off the evaperator((( Hence Frost Free ))) and the water goest into the (((( evaperator cover or pan ))) and flows to the defrost drain hole to a pan under the machine.
They make a after market heater for the drain... it is a pain to install.
First I would try to defrost the drain by poring war water down it and verifying it goes into the pan at the bottome of the machine.
When your done you will need to silicone around the (((cover / pan))) where it covers the defrost drain hole.
Good Luck
Don
Mr Fix it
After further research I found out this evap was made by Tempstar. Found a drain pan for it herehttp://www.expertappliance.com/tempstar-...
$265 seems expensive for a plastic pan, but cheaper than a new evaperator.
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