Steven Z Colville , WA February 13, 2023 Appliance: Maytag Refrigerator MSD2454GRW Maytag Refrigerator Msd2454grw: The freezer side was not defrosting ice build up. How to replace Refrigerator Defrost Heater And Thermostat Assembly. Pulled the back panels, popped out the bad Defrost Heater and put in the new one. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes