If fans, compressor and LED display do not function at all, test your power source again. If the power source is working, then check controller fuse. Select your cooling unit type for fuse replacement manual:
If the unit worked initially but has since failed to function, then the electronic controller has been damaged, most likely due to a power surge. The problem can be corrected by replacing the controller, which does not require a skilled technician. The controller can be replaced without removing the unit from its installation. We can provide a replacement controller and an illustrated manual to guide you through the procedure. For out-of-warranty units, the controller is $50 plus shipping.
To see how to replace your controller select your unit.
To purchase controller please select one of the following links:
Nuvo/Winekoolr (Cabinet style) KoolR/KoolR Plus/Piccolo/Magnum (Custom designed wine room)
OUT OF WARRANTY: (I purchased my unit more than a year ago)
You can Extend your cooling unit Warranty: Why Extended Warranty?