Topics:

• Why is there a gurgling noise coming from the refrigerator, freezer, or wine storage unit?
• Why is there a hissing noise coming from the Sub-Zero when the door is closed?
• A service technician suggested increasing the unit's temperature to resolve the noise
• Refrigerant noise, freon hissing, Designer (formerly Integrated) noise
• Drain gurgle

Troubleshooting:

A gurgling or hissing noise from a Sub-Zero can be attributed to a number of things, such as a partially plugged drain tube, water drainage during the defrost cycle, or evaporator operation. Such noises are usually considered normal operation.

• If a noise is new, gets louder over time, or does not go away, service may be needed to determine the source of the noise. Contact Factory Certified Service to schedule an appointment for repair.
• Setting the unit's temperature to a higher, warmer temperature may prevent water from freezing in the drain tube, also preventing a partially plugged drain. Sub-Zero recommends 38°F (3°C) in a refrigerator and 0°F (-18°C) in a freezer. Refer to Refrigerator and Freezer Temperature Settings for more information.
• For additional information, refer to:
  • Refrigerator or Freezer Noises
  • 500 or 600 Series Freezer Drain Tube Cleaning
  • Freezer Drain Tube Cleaning
  • 200/300, 500, and 600 Series Refrigerator Drain Tube Cleaning
  • BI, 700, 400, 648PRO Series Drain Tube Clogged

Answer:

If the issue persists, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.