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

Description

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 COMPONENT — PROFESSIONAL SERVICE REQUIRED
Gas 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

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.