John F Limerick , PA December 16, 2014 Appliance: Model SAMSUNG FRENCH DOOR TWIN COOLING REFRIGERATOR Defrost heater was not working Completely defrosted the refrigerator ,took 2days then replaced temp sensor and heater the repair took about 45 minutes so far everything is working fine 20 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes