Skip to main content

Sub-Zero Blue or Green Ice Cubes or White Flecks in Ice


  • Why are ice cubes green?
  • Why are ice cubes blue?
  • What to do when ice maker makes blue or green ice cubes?
  • Why are there white flecks in the ice cubes?
  • Why are ice cubes cloudy?


  • Copper corrosion in the water line supplying the refrigerator causes blue or green ice
  • Cloudy ice is the result of mineral deposits in the water that appears as the ice dries out
  • Calcium deposits in water cause white flecks in ice cubes, especially as it melts
    • When water freezes and thaws, the minerals in it concentrate and the thaw cycle contributes to this
    • Ice shrinks as it evaporates, leaving this concentrated mineral "residue"


  1. Verify no service messages, icons, or error codes are shown.
  2. If installed, verify the in-line water filter is not expired. See also:
  3. Verify a Sub-Zero water filter is being used. Refer to Non-Sub-Zero Water Filters for further information
  4. Adding an in-line water filter (available at most home improvement stores) may reduce or eliminate discoloration.
    • Refer to the product Installation Guide for water pressure specifications.
    • Calcium deposits may just be in the water line to the unit. Using the filter in the unit (Classic (BI) and Designer (IT, IC)) or adding a filter to the water line can help reduce calcium deposits.
    • Calcium deposits are not visible in liquid water. To test home water supply, use water from a different tap to make a batch of ice in an ice tray.
  5. Discontinue use of ice.
  6. Consult with a local plumber.
    • Plumbers may clear water lines and replace corroded plumbing fixtures for blue/green ice.
    • Plumbers may suggest the best kind of filter for white sediment in water.
  7. For any other color ice cubes, contact a plumber, as this is a water or water line issue.
  8. If these steps do not resolve the issue, no further troubleshooting advice is available. 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.

Ask Your Question

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