The Heatcraft 28913701 Defrost Temperature Sensor is an OEM replacement component designed to monitor evaporator coil temperatures in commercial refrigeration systems. It detects temperature changes and sends signals to the defrost control circuit, helping regulate defrost cycles and terminate heating when the required temperature is reached. Compatible with select Heatcraft walk-in c... https://www.partshnc.com/heatcraft-28913701-defrost-temperature-sensor