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

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

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$83.99
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SKU:
42001-0053S

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About This Item

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

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.

CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
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Pentair Pool Products and Parts

About Pentair Pool Products and Parts

Pentair is often considered the "gold standard" for pool professionals, and for good reason. Founded in 1966 (originally by five inventors making high-altitude balloons!), the company has evolved into the global leader in smart, sustainable water solutions. For the DIY homeowner, Pentair represents the intersection of rugged durability and silicon valley-tier technology. They pioneered the Variable Speed Pump revolution with the IntelliFlo®, saving American pool owners millions in energy costs. Today, their ecosystem focuses heavily on automation, allowing you to control your pump, heater, lights, and chemistry from a single app. While they are a favorite among professional builders, their "EC" (E-Commerce) line of equipment allows homeowners to access pro-grade technology with valid warranties for DIY installation.

Why We Trust Pentair Pool Products and Parts
Energy Efficiency Leaders: Recipient of the ENERGY STAR® Partner of the Year award for over a decade; their pumps are designed to pay for themselves in energy savings.

Smart Automation: The Pentair Home App and IntelliCenter systems offer best-in-class control over your pool ecosystem from anywhere in the world.

Professional Pedigree: The brand most often recommended and installed by pool builders for high-end residential pools.

Eco-Conscious: Dedicated to reducing water waste and energy consumption through "Green" technology innovations.

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