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Re: sub zero 632S error code 21
EC 21 has nothing to do with the refigerator. From the 600-2 series service manual page 3-21 EC 21 is
Defrost Overheat fault. The defrost system is only in the freezer and on a completely seperate refrigeration system. Clear the EC by holding the bell key pad down until you here a tone this is going to be a minimum of 15 but can be as long as 30 depending on the generation of your appliance. The part that you will most likely need to replace is the defrost terminator which stops the defrost cycle. You may have also had a problem in the refrigeration section which did fix by yourself, good job.
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The freezer side may be icing up. Soon enough the fridge side may have problems, too. Love those Sub-Zeros, but if the defrost timer fails, it will ice up. Defrost timer is up top. A generic one will do.
That particular error code is for a defrost overheat. The thing about that error code is that most of the time there is nothing wrong. The reason for this is there is a sensor that is located in the freezer and is connected to the control board located in the refrigerator. They are connected by three sections of wire that connect together instead of one continous wire. Over time these connections lose good connection, mainly because of exposure and in doing so the main control board thinks of it as a failure in the defrost system because thats the only purpose of that line. In the past sub zero would have us access the sensor, and folling the wire,cut each connection out and tie the line together with wire nuts to form a more solid connection. I want to say the wire is yellow but its been a while so don't quote me on the color.
The ice forming on the back wall of your sub zero indicates that you have a part failure. I don't recall exactly what the part is but as soon as you mention your symptoms to a sub zero repairman he'll know your problem. It's an easy fix. Everything comes out of the fridge, takes the inside back wall off and replaces the part. Not an inexpensive repair, however the part is guaranteed for 5 years so you may have an opportunity to have it replaced under warranty as I did.
05 Refrig. Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
06 Refrig. Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
07 Freezer Cabinet Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
08 Freezer Evaporator Thermistor read open or shorted for 10+ seconds, or repeatedly read erratic temp’s
20 Defrost Under-heat with No Voltage Feedback Through Gray/White Wire at Defrost Start
21 Defrost Overheat
22 No Voltage Feedback Through Gray/White Wire at Defrost Start
23 Defrost Overheat with No Voltage Feedback through Gray/White Wire at Defrost Start
24 Defrost Under-heat
30 Excessive Icemaker Water Valve Solenoid Activation (Exceeded 15 Seconds)
40 Excessive Freezer Compressor Run
50 Excessive Refrigerator Compressor Run