Sub-Zero Classic Series Does Not Make Ice


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


  • No ice production in Classic (formerly Built-In) Series (BI) model
  • Ice maker will not cycle on BI product
  • Ice maker does not work and no fault codes

Steps to Verify Issue:

For models other than Classic series, refer to Ice Maker Does Not Make Ice.

If the ice maker in a Classic Refrigeration product stops making ice, try these steps. If ice production does not resume, a Factory Certified Service visit is recommended.

  1. After turning on the product and the ice maker, wait 24 hours for ice production. It may take this long to see ice cubes in the ice bin. The freezer first cools to temperature, then ice cubes form and drop into the bucket.
  2. Verify the ice maker is on. Press the Ice Maker key if a single ice cube does not show on the display next to the freezer temperature. Note: Once the ice maker is on, water may not flow into it immediately.

  3. Make sure the water supply to the unit is turned on. Refer to Water Line Shut-Off Valve Location for details. Examples shown are in the OFF position.

  4. If a single ice cube is flashing on the control panel, hold the ALARM key for 15 seconds. The display will read CFC. ALARM is just to the left of POWER on the control board.
  5. If the cube continues to flash, hold the Max Ice and Ice Maker keys together for 5 seconds. Resetting a flashing cube may return and requires service if ice production does not return to normal.
  6. Warm temperatures impact ice maker performance. Sub-Zero recommends 0°F freezer temperature. Clean the condenser if it is above 5°F. See How to Clean a Classic Condenser.
  7. Change water filters as often as recommended, typically every 6-12 months. See How to Replace Water Filter. Reset the water filter after changing it. See How to Reset a Classic Water Filter.
  8. Reseat the water filter (if present) by removing and installing it even if it is not due for changing. See How to Replace Water Filter.

  9. If one is present, verify the home inline water filter is not expired. See Inline Water Filters for more information.
  10. Confirm good water pressure to the unit. See How to Confirm Water Pressure to the Product.
  11. Make sure the ice maker shut-off arm is in the down position. If the arm is up, turn the unit off and push down gently. The ice maker arm only moves an inch.

  12. Make sure the ice maker white plastic rudder arm is attached to the shut-off arm and reattach if needed. If broken or cracked, replace the ice maker shut-off arm.
  13. Make sure the ice maker is free of obstructions or jammed ice cubes. Defrost the freezer to clear the ice maker. if needed. Refer to Manually Defrost a Sub-Zero for instructions.
  14. Make sure the ice maker water fill tube is open and not frozen. After defrosting any blockage, turn the unit off, then on again to reset. Refer to Ice Maker Fill Tube Frozen for more information.
  15. 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 Sub-Zero with Reverse Osmosis Water System.
  16. After completing these steps, wait 24 hours for ice production to resume.
  17. 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:


Refer to Ice Maker Does Not Make Ice for more information and links to other product lines.

Thank you for your request. A Customer Care representative will contact you.

An error occurred. We were unable to submit your request.

Related Questions

We're standing by with answers

Whether you're shopping for appliances or have questions about those you already own, we've got the resources you need. Talk directly to a customer care expert at the Sub-Zero, Wolf, and Cove service center, or connect with an appliance consultant at an official showroom near you. Get quick answers online, or reach a certified service provider or installer. And much more.

Call us at (800) 222-7820

Customer Care and Support