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 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 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.
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