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500 or 600 Series Freezer Drain Tube Cleaning


  • How to clean a freezer drain tube if it is frozen, clogged, or dirty?
  • How to clear a drain tube in a 600 Series prior to serial #1810000
  • How to unclog a 500 Series freezer drain tube
  • Where is the drain tube located?


  • Frozen drain tube
  • Food particles in drain tube causing clog


For the most applicable information, first determine your product model by referring to the serial tag. To locate the serial tag, refer to Sub-Zero Serial Tag Locations.

  1. Turn the unit off at the Unit ON/OFF key.
    • Turn the dial on a 500 Series down past 1 to OFF. This will turn off the freezer only.
  2. Allow the unit to defrost with the door or drawer open until it is at room temperature and dry.
  3. Watch for dripping water and clean up as needed.
  4. Remove the drain pan and empty as needed, see Drain Pan Removal.
  5. The freezer drain tube is covered by a drain trough enclosure that is not removable.
    • It is not possible to flush out the same way the refrigerator drain tube can.
    • Do not disconnect the drain tube.
  6. For clogged drains accompanied by the following, contact Factory Certified Service to schedule an appointment for repair:
    • Poor temperatures
    • Door seal issues
    • Service light indicators
    • Any other problems
  7. If these steps do not resolve the issue, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.

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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