Pentair UltraTemp Defrost Sensor Probe Thermistor (473665Z)

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This defrost sensor probe thermistor is used in compatible Pentair UltraTemp heat pumps to monitor temperature conditions related to defrost control. Accurate sensor feedback helps the system determine when frost management is needed and supports proper heat pump operation in cooler or humid conditions. A failed or inaccurate thermistor can contribute to error codes, poor heating performance, or improper defrost behavior.Replacing the sensor is a focused repair when diagnostics point to temperature-sensing issues rather than airflow, refrigerant, or control board problems. It is suitable for service technicians maintaining UltraTemp equipment and should be matched by part number before installation. Always disconnect power before servicing electrical components. Show more