{"product_id":"pentair_42001-0063s","title":"Pentair MasterTemp \u0026 Sta-Rite Max-E-Therm High Limit Switch | 42001-0063S","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp style=\"background-color: #fff3cd; border: 2px solid #FFEAA7; padding: 15px; border-radius: 5px; margin: 15px 0; color: #856404;\"\u003e\u003cstrong\u003e⚠️ IMPORTANT: GAS HEATER COMPONENT — PROFESSIONAL SERVICE REQUIRED\u003c\/strong\u003e\u003cbr\u003eGas 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 20px 0; border: 1px solid #ccc;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f8f9fa;\"\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e\u003cstrong\u003ePentair Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 10px;\"\u003e42001-0063S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003ePro Tip\u003c\/h3\u003e\n\u003cp\u003eBefore 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.\u003c\/p\u003e\n\u003c!-- DRAFT STATUS --\u003e\u003c!-- wft:processed:manual:2026-03-30 --\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":53912382832915,"sku":"42001-0063S","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/0687\/5411\/files\/PEN420010063S_0.jpg?v=1772793773","url":"https:\/\/poolaroo.com\/products\/pentair_42001-0063s","provider":"Poolaroo","version":"1.0","type":"link"}