If you are experiencing Sub-Zero refrigerator issues do not hesitate to call Atlanta Expert Appliance Repair. As a matter of fact, Sub-Zero has a great on board diagnostics system that warns the homeowner when there is a problem. Most of these refrigerators ​these days have an electronic error system located right in the interface controller. Look for a icon that resembles a "wrench". This is meant to represent service. If it is visible on the display that means you should at least check certain things such as a dirty condenser coil and clean it. If this wrench is flashing it may be more serious. Try calling us immediately to schedule service.