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Sub-Zero Undercounter Refrigerator/Freezer with Ice Maker (UC-24CI) Does Not Make Ice


  • No ice production in Undercounter Refrigeration Series (UC) model
  • Ice maker will not cycle on UC Undercounter product
  • Ice maker does not work and no fault codes


  • Possible jammed ice cube
  • Low water pressure
  • Frozen ice maker fill tube
  • Warm freezer temperature
  • Water valve energized longer than fifteen seconds


  1. After the unit is turned on, wait 24 hours for ice production. It may take this long to see ice cubes in the ice bin.
  2. Verify the ice maker is turned on. If the ice level arm is in the up position, the ice maker is turned off.
    • To resume ice production, turn the unit off and push the arm down gently. The ice maker arm only moves an inch. See also, Ice Maker Control Arm Will Not Lower.
    • Note: When the ice maker is turned on, water may not flow into it immediately.
  3. Make sure the ice bin is properly installed and is level and seated in place.
  4. Make sure the ice maker is free of obstructions or jammed ice cubes.
  5. Make sure the water supply to the unit is turned on. Refer to Water Line Shut-Off Valve Location for details.
  6. Warm temperatures impact ice maker performance. Confirm the freezer temperature is at or below 5°F. Sub-Zero recommends 0°F freezer temperature.
  7. Make sure the condenser is clean. See Undercounter Models Condenser Cleaning for instructions.
  8. If installed, verify the home inline water filter is not expired. See Inline Water Filters. See also, Sub-Zero Does Not Have a Water Filtration System.
  9. Confirm good water pressure to the unit. See How to Confirm Water Pressure.
  10. Make sure the ice maker water fill tube is not blocked. See Ice Maker Fill Tube Frozen.
    • After freeing blockage, turn the unit off, then on again to reset.
  11. If ice production stops often with the use of a reverse osmosis system or well water, a pressure booster or regulator may improve performance. Contact the reverse osmosis provider or speak with a plumber for suggestions. See also, Sub-Zero with Reverse Osmosis Water System.
  12. After doing these steps, wait 24 hours for ice production to resume.
    • If ice production does not resume after following these troubleshooting steps, service is needed to expertly diagnose and repair the unit. Contact Factory Certified Service to schedule an appointment for repair.

See also:


If these troubleshooting steps do not resolve the issue, service is necessary to expertly diagnose and repair the product. Contact Factory Certified Service to schedule an appointment for repair.


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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