This video from Sears PartsDirect shows how to troubleshoot problems with your refrigerator’s compressor. The compressor circulates refrigerant throughout the cooling system. If your refrigerator’s not cooling, the compressor could be to blame. But before you have a technician replace it, you should check the start relay, which activates the compressor. Another possible problem could be the electronic control board, which sends power to the compressor, or the wires that connect the two. This video will show you how to use continuity checks to figure out what the problem is, and show you how you may be able to fix it yourself.