Michael M New Braunfels , TX October 24, 2021 Appliance: Whirlpool Refrigerator WRS588FIHZ00 Whirlpool Refrigerator Wrs588fihz00: Defrost heater failure. How to replace Heater. I changed the bimetal defrost thermostat, and the heating element and it worked like a champ! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes