Pentair UltraTemp Defrost Sensor Probe Thermistor (473665Z) unitedspas Choosing the correct heater style

Choosing the correct heater style helps preserve intended system performance and supports a cleaner service result

A replacement filter cartridge helps remove suspended debris so the circulation system can continue supporting cleaner water

This part is useful when the original piece has become worn

Improves installation confidence and long-term serviceability

Pentair UltraTemp Defrost Sensor Probe Thermistor (473665Z) unitedspas Choosing the correct heater styleThis 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