Why Is Your Sub-Zero Refrigerator Making a Loud Humming Noise? Solutions & Expert Advice
This article originally appeared on our friends’ C&W Appliance Service’s website. C&W is the only Sub-Zero Premier Partner serving Dallas, Fort Worth, Austin and San Antonio, TX. C&W provides exceptional service, being recognized as the top appliance service company in the nation by Sub-Zero, Wolf, and Cove, based on customer satisfaction scores and as the 2025 Most Professional Servicer in their size category nationwide by the United Appliance Services Association.
Understanding the Causes of a Loud Humming Noise in Sub-Zero Refrigerators
Experiencing a persistent humming noise from your Sub-Zero refrigerator can be concerning. While some noise is normal, an unusually loud or continuous hum may indicate an issue. Common causes include:
- Evaporator Fan Motor Issues: The evaporator fan motor circulates air within the refrigerator. If faulty, it can produce a loud humming noise. To diagnose:
- Open all refrigerator and freezer doors; if the noise stops, the fan motor may be the issue.
- Close only the refrigerator door; if the noise resumes and your unit has an air purification system, the sound might originate from the air filter fan.
- Close only the freezer door; if the noise returns, the freezer evaporator fan motor could be the culprit.
- Dirty Condenser Coils: Accumulated dust and debris on condenser coils can force the refrigerator to work harder, resulting in louder operation. Regular cleaning of these coils is recommended to maintain efficiency and reduce noise.
- Loud Compressor: While some humming is normal, an unusually loud compressor may indicate a problem. If the compressor noise increases over time, it is advisable to have it inspected by a professional technician.
- Buzzing Water Inlet Valve: A humming or buzzing sound during the ice maker’s fill cycle is typically normal. However, if this noise becomes excessively loud or persists beyond the fill cycle, it could signal a clogged or malfunctioning water inlet valve, necessitating professional inspection.
For comprehensive guidance and detailed troubleshooting steps, please refer to the complete article on C&W Appliance Service’s website.
Appliance Professional: Your Local Sub-Zero Experts in the Midlands
At Appliance Professional, we are factory-authorized to service the Sub-Zero family of brands – Sub-Zero refrigerators, freezers, and ice machines, Wolf cooking appliances, and Cove dishwashers. We are committed to delivering exceptional service in Columbia, Lexington, Cayce, West Columbia, Hopkins, Forest Acres, Elgin, Blythewood, Irmo, and Chapin. If your Sub-Zero refrigerator is experiencing issues, our skilled technicians are ready to assist. Call us or click today to schedule a service appointment.
