Thomas K Chattanooga , TN October 22, 2016 Appliance: Magic Chef Refrigerator MCBR1010W Magic Chef Refrigerator Mcbr1010w: Defrost cycle not working. How to replace Refrigerator Defrost Thermostat. Replaced defrost thermostat 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes