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Sub-Zero Light Terminators

Topics:

  • Refrigerator or freezer lights do not work
  • Light terminator shut off lights
  • Lights turned off while the door was opened for an extended period of time
  • Why did the lights turn off when the unit was being cleaned or loaded with food?
  • The door was open, and the lights turned off
  • Why does the panel read L OC, LOC, L0C, L 0C with the lights out, and how do you reset?
  • Dispenser does not work when light is out
  • Bulk ice not working, door left open
  • If zone is turned off, will lights still go out if door left open for extended period?

Steps to Verify Issue:

Light terminators are a safety feature that help to prevent high temperatures in a unit, as lights can become very hot when left on for long periods of time. In most models with this feature, the control panel is disabled when the light terminator is active and will not respond.

500 / 600 / 700 Series / IC-27

  1. If a door or drawer is left open and the light terminator reaches a high temperature, power to that section only is disabled.
  2. Close the door without opening it for 45 minutes.
  3. When the terminator cools, the lighting and operation is restored.
  4. Controls may still function with the light terminator active, depending on model.

Built-In Series Made Before 12/18/2009

  1. If a door or drawer is left open and the light terminator reaches a high temperature, the lighting in that section only is disabled. The unit will continue to run (compressor and evaporator fan will both run).
  2. Close the door without opening it for 45 minutes.
  3. When the terminator cools, the lighting will be restored.
  4. If any control buttons are pressed with lights out, they will not work; therefore, the unit can not be turned off during this time.

Built-In Series Made From 12/18/2009 until 10/1/2012

  1. If a door or drawer is open 15 minutes, power to both the refrigerator and freezer section lights is cut off.
  2. The lights will remain off for 45 minutes after the door is closed, and all evaporator fans will run with the door or drawer open.
  3. Close the door without opening it for 45 minutes, or bypass the 45 minute wait by powering the unit off either at the breaker or unplugging it and turning back on.
  4. Pressing any keys on the panel when the lights are out will result in the panel reading L OC.

Built-In Series Made After 10/1/2012

  1. If a door or drawer is open 15 minutes, power to both the refrigerator and freezer section lights is turned off.
  2. The lights remain off for 45 minutes after the door is closed, and all evaporator fans continue to run normally.
  3. Close the door without opening it for 45 minutes, or bypass the 45 minute wait by powering the unit off either at the breaker or by unplugging it and turning it back on.
  4. Pressing any keys on the panel when the lights are out will result in the panel reading L OC.
  5. The unit will display D OR, and the chime will go off, even if the ALARM feature is not turned on.

Built-In Series Prior to Serial Number 4100000

  • The door dispenser will work, but bulk ice dispenser does not.

Built-In Series After Serial Number 4100000

  • The dispenser and bulk ice will work after lights have tripped off.

Built-In Internal Dispenser Models

  • Internal dispenser will not work when light is out.

Designer (Formerly Integrated) Products

  1. If a door or drawer is open 10 minutes, power to both the refrigerator and freezer section LED lights are changed from 100% on to 30% on.
  2. The lights remain off for 10 minutes after the door is closed, and all evaporator fans continue to run normally.
  3. Bypass the 10-minute wait by powering the unit off either at the breaker or unplugging it and turning back on.
  4. During the minimum off time when the lights are on at 30% due to reaching maximum on time, a 10-second screen appears when opening the door showing “Lights temporarily disabled to prevent overheat, please wait 10 minutes.”
    • This screen will take lowest priority over any other splash screens for errors or alarms.

Note: On all series, disabling a zone will have no effect on the light terminator. The lights still go out if the door is left open as noted above.

See also:

Answer:

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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