Heil Heat Pump Defrost Sensor HVAC Sensors & Probes

Heil heat pump defrost sensors are OEM-style replacement thermistor sensors (also called coil temperature sensors or defrost temperature probes). They help your heat pump's defrost control work correctly. The sensor mounts on the outdoor coil. It reads coil temperature and sends that reading to the defrost control board. The board uses it to decide when to start a defrost cycle and when to return to normal heating.

Key Features:

• Thermistor-based sensing: the sensor's resistance changes with coil temperature, so the control board gets a consistent signal.
• Helps prevent coil icing: a working sensor lets the system clear frost before it restricts airflow and cuts heating efficiency.
• Protects the system: correct defrost timing reduces strain on the compressor in freezing weather.
• Matched trip and reset temperatures: each part number is calibrated for its own trip and reset points, so use the one specified for your unit.
• Direct replacement design: built to fit existing coil sensor mounts and connect to the factory wiring.

A failing defrost sensor can leave a heat pump with heavy frost or a solid block of ice on the outdoor coil. It can also cause poor heating performance. Replacing the sensor is a common repair that helps restore reliable winter operation. Choose the specific part number that matches your equipment.