When your refrigerator is showing signs of frost build-up and inconsistent cooling, the defrost heater (17431000001010) might be the issue. This genuine OEM part is designed for the Criterion 18 Cu.Ft. Top Freezer Refrigerator. A malfunctioning defrost heater can lead to ice accumulation, affecting your appliance's efficiency. Before purchasing, verify your refrigerator's model number to ensure compatibility.