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Sub-Zero Undercounter (UC) Door Ajar Alarm


  • Door ajar alarm
  • Bell rings when door is open
  • Undercounter unit beeping
  • Chimes
  • Turn off or on door ajar alarm on Undercounter
  • UC24 alarm


A chime indicates the door has been left ajar for more than 30 seconds. The unit is shipped with the door alarm turned on.

  1. To turn off, verify the unit has been turned on for more than 30 seconds.
  2. Touch and hold WARMER and COLDER on the control panel simultaneously for 5 seconds. A chime indicates the alarm has been turned off.
    • For UC-24C(I), use the refrigerator-side COLDER and WARMER keys.  
  3. Reverse the process to turn on the alarm. The bell(1).png icon appears in the control panel display when the door alarm is turned on.

Refer to the product Use and Care Guide for further information.

  • The use and care guide states the alarm sounds after 60 seconds. This is incorrect.

For other models, see also:


Need further assistance? Contact Customer Care at 800.222.7820 or provide your information below and request a Customer Care representative contact you.

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