Slow Ice Production


  • Why is ice production slow?
  • Why does the ice bucket take so long to fill?
  • Slow ice production
  • Unit makes ice cubes but very slowly and not very many in a day.

Steps to Verify Issue:

The ice maker inside a freezer will make 8 cubes of ice every 2-3 hours on average, this is considered normal operation. Undercounter ice makers produce a batch of ice every 30 minutes or so.

  • Depending on specific model, the ice bucket may take 1-2 days to fill completely.
  • If equipped, activating the Max Ice feature will increase ice production for a 24 hour period.

If ice production is slower than expected:

  1. Verify no service messages, icons, or error codes are displayed.
  2. Ensure unit has been powered on for at least 24 hours.
  3. Confirm freezer temperature is below 5°F.
    • Temperatures above 5°F can affect ice maker performance.
    • Sub-Zero recommends 0°F freezer temperature.
  4. Verify unit's condenser has been cleaned within the last 3-6 months. See Clean the Condenser.
  5. Ensure the ice bucket is properly installed.
  6. For over-and-under units, verify the upper basket is properly installed. If not installed correctly it may sit too high, causing the ice maker to turn off prematurely.
  7. Verify the ice maker shut-off arm is in the down position.
  8. Ensure ice maker rudder arm is attached to the shut-off arm.
  9. Verify the ice maker fill tube is not obstructed.
  10. Ensure there are no obstructions or jammed ice cubes in ice maker assembly.
  11. Verify no recent plumbing or water pressure issues in home.
  12. If installed, ensure in-line water filter is not expired.
  13. For undercounter, stand alone ice makers, also ensure the unit is properly cleaned and sanitized regularly, see UC-15 and 315 Cleaning information.
  14. See also:

Refer to the product use and care guide for further information.


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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