Tom K Bloomington , IN November 16, 2019 Appliance: Frigidaire Refrigerator FRS26ZSHB4 Frigidaire Refrigerator Frs26zshb4: Not defrosting refrigerator warm. How to replace Defrost Heater (Evaporator). Defrost heater bad. Replaced it and timer and thermostat Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes