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Sub-Zero 650 model shows error code 21 (Defroster Overheat) EC

Sub-Zero 650 model shows error code 21 (Defroster Overheat) EC

 

Customer Question:
Sub-Zero 650
shows error code 21 (Defroster Overheat)EC 21 has been showing for about 6 months. If I open the circuit breaker the EC clears, but returns later. I have cleaned the heat exchangers. The refrigerator runs just fine. What’s the problem and what can I do to fix it?

Expert: Dennis replied:
Hello,
Sub-Zero Error code: EC21 EC24
Cause of error code: Defrost Functionality Issue
Solution 1: If temperatures are high call for service.
Solution 2: If temperatures are near normal range:
a – Clean the condenser
b – Press and hold the door ajar alarm key for 15 seconds to clear the error code
c – If EC Service light appears, or temperatures rise contact service for repair: 800-440-8583
Defrost overheats means the defrost temperature exceeded the temperature where the heater should have stopped already. This is a problem with the defrost termination thermostat. This part should have open up the heater circuit already once the temperature of the evaporator is above freezing temperature.

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431 S Burnside Ave, Los Angeles, CA, 90036
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