Sub-Zero Appliance Error Codes

Refrigerator, Freezer, Icemaker and Wine Cooler Error Codes

• EC 05 Inconsistent temperatures in the freezer or refrigerator.
• EC06 Thermistor Fault: The temperature sensor is malfunctioning and causing inaccurate temperature readings.
• EC07 Evaporator Sensor Fault: The evaporator sensor is not reporting proper temperature levels.
• EC10 Sensor Failure: Internal sensor is reporting invalid temperature values.
• EC15 Control Board Error: Internal control board failure disrupting cooling performance.
• EC20 Freezer Sensor Failure: Sensor readings are incorrect, causing temperature instability.
• EC21 Defrost system fault, often related to the defrost terminator; requires service.
• EC 22 Wiring issue at defrost start; requires service.
• EC24 Defrost Heater Error: Defrost system is unable to activate or complete cycle.
• EC30 Evaporator Fan Error: Fan is not running or airflow is too weak.
• EC 38 compressor issues, often seen in Sub-Zero refrigerators
• EC40 High Temperature Condition: Refrigerator failed to maintain safe cooling levels.
• EC50 Compressor / Sealed System Error: Freezer cannot maintain temperature due to internal cooling system failure.
• EC 55 Freezer defrost mode issue, likely evaporator thermistor problem.
• EC 80 Variable speed compressor problem.
• EC 85 Overpressure on the compressor.
• EC 86 Communication failure between compressor and control board.
• EC91 Voltage Irregularity: Improper voltage detected; unit may shut down for protection.