Extremely Cold Temperature on Display


  • Unit may be in wrong temperature mode
  • Stuck relay may cause compressor to continuously run and create very cold temperatures


  • Temperature in a Sub-Zero shows very cold temperatures like -20°
  • Temperature not showing correctly
  • Unit runs all the time and extremely cold temperature shows on control
  • Refrigerator and freezer temperatures are reading too cold
  • Freezer is too cold and runs constant

Steps to Verify Issue:

  1. Verify the unit is connected to a dedicated power source.
  2. Turn unit off at the control panel and listen. If the unit is still running, service is needed.
  3. Verify the unit is not being powered by a generator.
  4. Verify the unit is set to show temperatures in degrees Fahrenheit. See also:
  5. Turn the unit off at the circuit breaker for 5 minutes and turn it back on.
  6. Give the unit 24 hours to return to normal temperatures between -5°F and 5°F.
  7. See also, Refrigerator Too Cold.


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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