Warm Refrigerator Troubleshooting


  • A fan in the unit not working properly
  • Temperature sensor or thermostat malfunction
  • Compressor, evaporator, or condenser issue
  • Problem with door seal or gasket

Core Issue:

  • What to do when temperatures rise in a refrigerator
  • Warm or high temperatures reported in refrigerator section
  • Why is the refrigerator not cooling or won't hold set temperature?
  • Unit does not cool well in warm months or humid, warmer temperatures
  • Food spoils before expiration date or food going bad quickly
  • Refrigerator stopped working

Steps to Verify Issue:

Only a Factory Certified Service technician can determine the exact cause of a cooling issue. For any warm temperatures in a Sub-Zero refrigerator:

  1. Verify the unit has been turned on for at least 24 hours. If not, wait 24 hours for unit to cool properly.
  2. Verify the unit is not in Showroom mode. This may be more likely if unit was used as a dealer display unit.
  3. Clean the condenser if not done in the last 6 months.
  4. Verify there are no error codes or service indicators on the electronic control panel. If so, address them individually.
  5. Check the setpoint temperatures for the compartment.
  6. Correct or remove anything obstructing the door from closing.
  7. Ensure the door was not left ajar for a period of time.
    • Turn the door ajar alarm on if it is not being used to ensure the door is closing all the way.
  8. New groceries or warm food will raise temperatures for a period of time.
  9. Verify if only one or all sections are not cooling.
  10. Wait 24 hours for the unit to return to normal temperatures after correcting any or all of the above.

See also:


If these steps do not resolve the issue, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair. 

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