{"product_id":"42002-0024s-stack-flue-sensor-replacement-for-pentair-mastertemp-max-e-therm","title":"42002-0024S Stack Flue Sensor Replacement | Fits Pentair MasterTemp \u0026 Sta-Rite Max-E-Therm Pool \u0026 Spa Heaters | New","description":"\u003ch2\u003ePool Heater Throwing an Error Code? This Sensor Is Likely the Fix.\u003c\/h2\u003e\u003cp\u003eWhen your Pentair MasterTemp or Sta-Rite Max-E-Therm pool heater shuts down unexpectedly or displays a stack flue sensor fault, the culprit is almost always the stack flue sensor. This aftermarket replacement for part number \u003cstrong\u003e42002-0024S\u003c\/strong\u003e is a direct-fit solution designed to restore your heater to normal operation — without the dealer markup. New, unused, and ready to install.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eDirect Replacement for 42002-0024S\u003c\/strong\u003e — aftermarket part engineered to replace OEM part number 42002-0024S (also referenced as 420020024S)\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFits Pentair MasterTemp \u0026amp; Sta-Rite Max-E-Therm\u003c\/strong\u003e — compatible with pool and spa heater models that use the 42002-0024S stack flue sensor\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eStainless Steel Threaded Probe\u003c\/strong\u003e — durable stainless construction with hex nut for secure installation into the heater flue port\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003ePlug-and-Play Connector\u003c\/strong\u003e — red connector plug and white wire lead match the OEM harness for straightforward installation\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eRestores Heater Function\u003c\/strong\u003e — addresses stack flue sensor fault codes that cause heater shutdown or lockout\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eBrand New, Unused\u003c\/strong\u003e — new aftermarket part, not refurbished or pulled; ships in sealed poly bag\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1x aftermarket stack flue sensor (stainless threaded probe, hex nut, red connector, white wire lead)\u003c\/li\u003e\n\u003cli\u003eCompatible part number: 42002-0024S \/ 420020024S\u003c\/li\u003e\n\u003cli\u003eFits: Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow to Install\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eTurn off and disconnect power\u003c\/strong\u003e to the pool heater completely before beginning any work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAllow the heater to cool\u003c\/strong\u003e fully if it has been recently running.\u003c\/li\u003e\n\u003cli\u003eLocate the existing stack flue sensor in the heater’s flue assembly.\u003c\/li\u003e\n\u003cli\u003eDisconnect the wire harness connector from the old sensor.\u003c\/li\u003e\n\u003cli\u003eUnthread the old sensor from the flue port using an appropriate wrench on the hex nut.\u003c\/li\u003e\n\u003cli\u003eThread the new 42002-0024S sensor into the flue port and tighten securely.\u003c\/li\u003e\n\u003cli\u003eReconnect the wire harness to the new sensor’s connector.\u003c\/li\u003e\n\u003cli\u003eRestore power and test the heater for normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eWho It’s For\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✔ Pool and spa owners with a Pentair MasterTemp or Sta-Rite Max-E-Therm heater showing a stack flue sensor fault\u003c\/li\u003e\n\u003cli\u003e✔ Pool service technicians performing heater diagnostics and repairs\u003c\/li\u003e\n\u003cli\u003e✔ DIY pool owners comfortable with basic heater component replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eVerify compatibility with your specific heater model and serial number before installation. If you are not comfortable working with gas appliances or electrical components, hire a licensed pool or HVAC technician. Always disconnect power before servicing pool equipment. This is an aftermarket replacement part; More4less Outlet is not affiliated with Pentair or Sta-Rite.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What heaters does this sensor fit?\u003c\/strong\u003e\u003cbr\u003eA: This sensor is a replacement for part number 42002-0024S, used in Pentair MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters. Verify your specific model uses this part number before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM or aftermarket part?\u003c\/strong\u003e\u003cbr\u003eA: This is an aftermarket replacement part engineered to fit in place of OEM part 42002-0024S. It is not manufactured by or affiliated with Pentair or Sta-Rite.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What fault code does a bad stack flue sensor cause?\u003c\/strong\u003e\u003cbr\u003eA: A failed stack flue sensor typically causes the heater to shut down or display a sensor-related fault or error code. Consult your heater’s manual for specific fault code definitions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Is this brand new?\u003c\/strong\u003e\u003cbr\u003eA: Yes — brand new, unused aftermarket part shipped in a sealed poly bag.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Do I need any special tools to install this?\u003c\/strong\u003e\u003cbr\u003eA: Basic hand tools (wrench for the hex nut) are typically sufficient. Always disconnect power before servicing and consult a licensed technician if unsure.\u003c\/p\u003e\u003ch3\u003eConfidence Guarantee\u003c\/h3\u003e\u003cp\u003eEvery item ships brand new and unused. If there’s ever an issue with your order, reach out and I’ll make it right.\u003c\/p\u003e","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":53971178094892,"sku":"101560084","price":19.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0963\/0964\/1516\/files\/42002-0024s-stack-flue-sensor-aftermarket-new.jpg?v=1787597086","url":"https:\/\/more4lessoutlet.com\/products\/42002-0024s-stack-flue-sensor-replacement-for-pentair-mastertemp-max-e-therm","provider":"More4less Outlet","version":"1.0","type":"link"}