David S Cedar Hill , TX March 22, 2016 Appliance: Whirlpool Refrigerator ED5PHEXNQ00 Whirlpool Refrigerator Ed5phexnq00: The whirlpool refrigerator/freezer would not defrost. How to replace Defrost Control Board. I checked the defrost heater element and the defrost thermostat. Both were fine. I watched a repair video for the defrost timer on a similar model. I replaced the control within 15 minutes. 3 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes