Thermistor 420010053S Pool Spa Heater Sensor Replacement 2 Pack for Pentair MasterTemp

Thermistor 420010053S Pool Spa Heater Sensor Replacement 2 Pack for Pentair MasterTemp Description

420010053S Heater Thermistor Sensor Description A directreplacement heater thermistor sensor designed to monitor pool and spa water temperature and feed accurate readings to the heater control system. Precision manufactured for reliable performance, corrosion resistance, and long service life. Key benefits Accurate temperature sensing: Operates across a wide range from 20 C to 80 C to detect pool or spa temperature and help maintain target set points. Durable construction: Stainless steel components provide hardness and corrosion resistance to reduce deformation and extend service life. Quick, straightforward installation: Precisionengineered fit reduces installation time to about 10 to 20 minutes for routine replacement or maintenance. No advanced tools required for standard installs. Compatibility for heater electrical systems: Fits commonly used MaxETherm and MasterTemp heater models, providing a suitable replacement part for affected systems. Features and specifications Model: 420010053S heater thermistor sensor Operating temperature range: 20 C to 80 C Material: Stainless steel housing for durability and corrosion resistance Function: Measures water temperature and provides input to heater control circuits Installation time: Approximately 10 to 20 minutes for a typical replacement Compatibility Compatible with MaxETherm 200, 333, 400 and MasterTemp 250, 300, 400 pool and spa heater electrical systems. Typical applications and use scenarios Replacement after sensor failure: Swap in the 420010053S when the existing thermistor is faulty or producing inconsistent temperature readings to restore accurate temperature control. Seasonal maintenance: Use as part of spring startup or fall winterization checks to ensure the heater has a reliable temperature sensor before heavy use or cold storage. Diagnostic troubleshooting: Install the sensor when diagnosing heating issues to verify whether temperature feedback to the control board is within expected ranges. Installation notes Designed for straightforward replacement; follow the heater manufacturer service manual for safe disconnection and reassembly procedures. Ensure the heater is powered off and fully cooled before beginning installation. Verify electrical connections and sensor seating for proper operation after installation. This thermistor sensor is intended as a quality replacement component to restore proper temperature sensing in compatible pool and spa heater electrical systems.