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Sub-Zero Refrigerator Error Codes and How to Address Them

Subzero refrigerators are known for their advanced technology and reliability. However, like any sophisticated appliance, they can experience issues that are indicated by specific error codes.

Understanding these error codes can help you diagnose problems and determine the necessary steps for repairs. This article will explain common Subzero refrigerator error codes and provide guidance on how to address them.

For professional assistance, Appliance GrandMasters offers top-notch refrigerator repair services in Greenville, SC.

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EC Codes and Their Meanings

EC 05 – Refrigerator Cabinet Thermistor Issue

  • Meaning: The thermistor reading the air temperature in the refrigerator is faulty.
  • Action: Clean the condenser coils to ensure they are free of dust and debris, then reset the error code by holding the “alarm” bell button for 15 seconds. If the error reappears, it is likely that the thermistor needs to be replaced. In this case, contacting a service technician for assistance would be the best course of action.

EC 06 – Refrigerator Evaporator Thermistor Issue

  • Meaning: The thermistor reading the evaporator temperature in the refrigerator is faulty.
  • Action: After cleaning the condenser coils and resetting the error code, if the error message reappears, the thermistor should be replaced. Seeking help from a professional technician is recommended.

EC 07 – Freezer Cabinet Thermistor Issue

  • Meaning: The thermistor reading the freezer’s air temperature is faulty.
  • Action: Examine the freezer for any evidence of frost accumulation, meticulously clean the condenser coils to ensure they are free from dust and debris, and reset the error code. If the error persists, it is essential to consult a service technician for a comprehensive diagnosis and repair.

EC 20 – Defrost Underheat

  • Meaning: The defrost system is not receiving voltage feedback, indicating it didn’t run long enough.
  • Action: Investigate the freezer for any signs of frost buildup, make sure the temperatures remain steady, and then reset the error code. If the problem continues, it is advisable to call in a professional technician to thoroughly examine and address the issue.

EC 21 – Defrost Overheat

  • Meaning: The defrost heater ran for too long.
  • Action: Reset the error code and monitor the refrigerator’s performance. Should the error code appear again, it is crucial to seek the expertise of a professional technician to prevent potential damage from prolonged overheating.

EC 24 – Defrost Underheat

  • Meaning: The defrost heater did not run long enough or did not get hot enough.
  • Action: Check for any frost buildup in the freezer, verify that the evaporator fan is functioning correctly, and reset the error code. If the issue persists, it is recommended to contact a technician for a thorough examination and repair.

EC 30 – Excessive Ice Maker Water Valve Solenoid Activation

  • Meaning: The ice maker solenoid was activated for longer than 15 seconds.
  • Action: Inspect the ice for irregular shapes, reset the error code, and check for any leaks. If the error continues to occur, seeking assistance from a service technician is advisable.

EC 40 – Excessive Freezer Compressor Run

  • Meaning: The freezer compressor is running excessively.
  • Action: Clean the condenser coils, ensure the fans are operating, check for frost buildup, and inspect the door seals. If these steps do not resolve the issue and the error persists, it is wise to schedule an appointment with a professional technician to thoroughly evaluate and fix the refrigerator.

EC 50 – Excessive Refrigerator Compressor Run

  • Meaning: The refrigerator compressor is running excessively.
  • Action: Clean the condenser coils, inspect for frost buildup, and ensure the door seals are intact. If the error code continues to display, it is advisable to have a professional technician come in to evaluate the refrigerator comprehensively and diagnose the underlying problem.

Vacuum Condenser Error Code

The “Vacuum Condenser” error code is one of the most general error messages on Subzero refrigerators, particularly in the older 600 series units from 1998 to 2002. This code indicates that the compressor has been running inefficiently or for an extended period.

Possible Causes:

  • Dust and debris on the condenser
  • Refrigerant leaks
  • Malfunctioning fans
  • Worn door seals and gaskets
  • Defrost issues
  • Old compressors and clogged heat exchangers

What to do:

  • Vacuum the Condenser: Clean the condenser coils to remove any dust or debris that may be causing the inefficiency.
  • Check for Other Issues: If vacuuming does not resolve the problem, inspect the refrigerator for other potential issues listed above.
  • Call for Service: If the error message continues to appear and there is a noticeable loss in temperature, it is advisable to reach out to a professional technician for further diagnosis and repair.
sub zero refrigerator error codes in kitchen


Understanding Sub-Zero refrigerator error codes is crucial for diagnosing and addressing issues efficiently. While some problems can be resolved with simple maintenance tasks like cleaning the condenser, others may require professional intervention.

In an emergency, knowing these codes can help you take immediate action. However, for more reliable and thorough diagnostics and appliance repair in Greenville, SC, contact Appliance GrandMasters. They are certified and licensed by Sub-Zero and Wolf brands for your comprehensive refrigerator repair services to keep your appliances running smoothly and efficiently.

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Expert Appliance Repairs

Don’t stress. Appliance GrandMasters provides professional appliance installation and repair services to keep your appliances in top condition. Let our skilled technicians handle the work, ensuring your appliances run smoothly and efficiently. Contact us today for all your appliance repair needs in Greenville.

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About Appliance GrandMasters

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Formerly known as Mr. Rogers Appliances, we rebranded our appliance repair company to Appliance GrandMasters in June 2020. Since then, we have focused on developing our brand to be customer-oriented. 

Fixing appliances has become a passion for us. We enjoy challenges and we are always studying to become the very best.

We accomplish swift and top-notch service by employing efficient and friendly customer service procedures that guarantee accurate answers and solutions. 

Our approach involves the careful selection and comprehensive training for the necessary skills to fulfill our customers’ needs. Through these strategies, we strive to consistently provide exceptional service.