I have a Whirldpool that quits cooling about every three years. I've fixed it each time. The problem is a inverter/frequency shifter keeps burning out. The compressor, an Embraco, is a 230 vac, 3 phase requires a inverter to convert 120VAC single phase to three phase 230VAC. The inverter does double duty as a frequency shifter to control the speed of the compressor while keeping the voltage constant. After the third time it burned out I plugged the refrigerator into a large surge protector. It has since died again. The other refrigerator from the early 90s is still working without any problems. The amount of energy the three phase compressor saved was more than canceled out by the cost of the parts to repair it