Pentair MasterTemp & Sta-Rite Max-E-Therm Pool Heater Thermistor | 42001-0053S

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The Pentair Thermistor (42001-0053S) is the OEM replacement temperature-sensing component for Pentair MasterTemp and Sta-Rite Max-E-Therm pool heaters. ⚠️ IMPORTANT: HEATER COMPONE NT — PROFESSIONAL SERVICE REQUIREDGas and electrical heater components must be serviced by a licensed pool professional or qualified HVAC technician. Do not attempt to service gas or high-voltage components without proper certification. The thermistor monitors water or air temperature within the heater's control circuit, providing real-time temperature data to the control board. A failed thermistor typically triggers a fault code on the heater's display and causes the unit to shut down or prevent ignition. Replacing a faulty thermistor with the correct OEM part restores accurate temperature sensing and normal heater operation. Specifications Pentair Part Number 42001-0053S Part Type Thermistor (temperature sensor) Pro Tip Before ordering, locate the fault code displayed on your heater's control panel and cross-reference it with your MasterTemp or Max-E-Therm service manual to confirm the thermistor is the diagnosed component. Multiple thermistors may be present in these heater models (water temperature and outlet temperature sensors); verify the part number stamped or printed on your existing sensor matches 42001-0053S before adding to cart. Consult manufacturer documentation to confirm the specific sensor location this part number corresponds to in your unit's configuration. Show more