Pentair MasterTemp & Sta-Rite Max-E-Therm High Limit Switch | 42001-0063S
Pentair Pool Products and Parts

Pentair MasterTemp & Sta-Rite Max-E-Therm High Limit Switch | 42001-0063S

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SKU:
42001-0063S

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About This Item

The Pentair High Limit Switch (42001-0063S) is the OEM replacement safety switch for Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. If your heater is shutting down unexpectedly or displaying a high-limit fault, this switch is the direct-replacement component designed for that system.

⚠️ IMPORTANT: GAS 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 high limit switch monitors water temperature inside the heater heat exchanger. When water temperature exceeds the switch's rated threshold — typically caused by restricted flow, a clogged filter, or a closed valve — the switch interrupts the heating circuit to prevent damage to the heat exchanger and surrounding components. A switch that has tripped repeatedly may fail to reset or may trigger nuisance shutdowns even when water flow is adequate, indicating it is time for replacement.

Specifications

Pentair Part Number 42001-0063S

Pro Tip

Before ordering, locate the original switch on your heater and confirm that 42001-0063S is printed or stamped on the component itself, or listed in the parts diagram of your heater's installation manual. The MasterTemp and Max-E-Therm platforms share a number of high-limit switch configurations — confirming the part number directly from the heater prevents ordering the wrong switch for your specific unit.

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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