Sub-Zero products are designed to last about 20 years on average. Due to varying levels of use, ambient temperatures, maintenance, and repair history and uncontrolled variables such as mechanical failure of part components, the life of any appliance will vary widely.
One of the hallmarks of a superior appliance is how quietly it operates and your Sub-Zero refrigerator is no exception. When your Sub-Zero refrigerator freezer makes noise it can be seriously annoying. Common causes include a faulty evaporator fan motor, ice build-up, and fan obstruction
Compressor is failing: A loud Sub-Zero humming noise often results as the compressor is malfunctioning. While the compressor can operate for a long time while failing, it should be evaluated and replaced by a professional service.
