{"product_id":"pentair-stack-flue-sensor-for-max-e-therm-and-mastertemp-heater-electrical-system-42002-0024s","title":"Pentair Stack Flue Sensor for Max-E-Therm and MasterTemp Heater Electrical System 42002-0024S","description":"\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgOEAA\" data-complete=\"true\" data-processed=\"true\"\u003e\n\u003cspan data-subtree=\"aimfl\" data-processed=\"true\"\u003eThe \u003c\/span\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e\u003cspan\u003e\u003ca class=\"SmjhRb bqYA2d\" data-cid=\"8159782437689136105\" data-pid=\"4753271733845577796\" data-iid=\"17299193365165638268\" data-link-behavior=\"nocobrowse\" role=\"link\" id=\"pvlinkpnziaq6GKcLk0PEPjN3Q-AU_dxep8q_1\" aria-describedby=\"pvlink-desc-pnziaq6GKcLk0PEPjN3Q-AU_dxep8q_2\" data-ved=\"2ahUKEwiu8ZjU5t2XAxVCMjQIHYwuFF8Qxa4PeggIAggBCA4QAQ\" href=\"https:\/\/www.google.com\/search?ibp=oshop\u0026amp;prds=pvt:hg,pvo:29,mid:576462483921676311,imageDocid:17299193365165638268,gpcid:1846516188826553813,headlineOfferDocid:4753271733845577796,catalogid:5514502862557345524,productDocid:8159782437689136105,rds:PC_1846516188826553813%7CPROD_PC_1846516188826553813\u0026amp;q=product\u0026amp;sa=X\u0026amp;ved=2ahUKEwiu8ZjU5t2XAxVCMjQIHYwuFF8Qxa4PeggIAggBCA4QAQ\" data-processed=\"true\" tabindex=\"0\"\u003ePentair 42002-0024S\u003c!--TgQPHd|||[]--\u003e\u003c\/a\u003e\u003c!--TgQPHd|||[[[\u0026quot;17299193365165638268\u0026quot;,\u0026quot;5514502862557345524\u0026quot;,\u0026quot;8159782437689136105\u0026quot;,\u0026quot;4753271733845577796\u0026quot;,null,\u0026quot;1846516188826553813\u0026quot;,\u0026quot;576462483921676311\u0026quot;,null,\u0026quot;hg\u0026quot;,\u0026quot;PC_1846516188826553813|PROD_PC_1846516188826553813\u0026quot;,null,null,null,null,null,null,null,null,null,29,null,null,null,null,null,null,null,null,\u0026quot;Pentair Stack Flue Sensor\u0026quot;,null,null,\u0026quot;1399514789446192122\u0026quot;,null,null,null,null,\u0026quot;42002-0024S\u0026quot;,[null,\u0026quot;42002-0024S\u0026quot;,null,1],null,null,null,0,\u0026quot;ErcCCvcBQUREYldlYXNNMXNOT0pSbEpBVEw0U3lIX1dJZTN3OEM0cGdVSlBic2Y3b21JTjVTdVV6bWJJU2JJVHdldHJ0TV9EZ1l5Ujl4Ny0yeXlSdWVsTk5wRmt3TmE5aGx2UGgyZzFsOWxOWHBCMlByM3dqNnJneUNhOWR3SERiOEFBaVhTMWVqdVNCMTFib2JDVEt3UVNsQlFvay1JN196Z08tUGdYMWNwNWJWZ2lDZXF0U0dtenlyMTNjbW1MdlRHTldhWmtBSENUeVdBS3lQY2JfOUtqV3NZNlFnRXNVdDNsM1A5eDlTM0hTN182a29qYndqeWt5dURCaxIXcG56aWFxNkdLY0xrMFBFUGpOM1EtQVUaIkFITjBFN0V3bGJEdEtfdmdwOUgzc2hqV0V4VlBXMUtNYXc\u0026quot;,null,null,1],null,0,1,\u0026quot;Eu4FCuIFIt8FaHR0cHM6Ly93d3cuZ29vZ2xlLmNvbS9zZWFyY2g_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\u0026quot;,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[null,1,0,1,null,null,null,null,null,null,null,null,[251717,null,1],null,null,[{\u0026quot;395\u0026quot;:[null,null,null,[null,[38990000,\u0026quot;USD\u0026quot;],4.11,9,null,\u0026quot;Pentair Stack Flue Sensor\u0026quot;,null,[\u0026quot;17299193365165638268\u0026quot;,1,154]]],\u0026quot;470\u0026quot;:[[\u0026quot;4753271733845577796\u0026quot;,\u0026quot;8159782437689136105\u0026quot;,null,\u0026quot;1846516188826553813\u0026quot;,null,null,\u0026quot;5360676509\u0026quot;,null,\u0026quot;1399514789446192122\u0026quot;,38990000,\u0026quot;USD\u0026quot;,null,null,null,[\u0026quot;4753271733845577796\u0026quot;,\u0026quot;40422035\u0026quot;,null,\u0026quot;1793216236717460\u0026quot;,\u0026quot;1793216236717460\u0026quot;,\u0026quot;1793216236717460\u0026quot;],null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,[[\u0026quot;4753271733845577796\u0026quot;,\u0026quot;40422035\u0026quot;,null,\u0026quot;1793216236717460\u0026quot;,\u0026quot;1793216236717460\u0026quot;,\u0026quot;1793216236717460\u0026quot;],null,\u0026quot;4753271733845577796\u0026quot;,\u0026quot;5360676509\u0026quot;,null,null,1,null,null,\u0026quot;22315300897\u0026quot;,\u0026quot;en\u0026quot;,[\u0026quot;5360676509\u0026quot;,0,\u0026quot;https:\/\/poolprincessinc.com\/\u0026quot;,\u0026quot;PoolPrincess\u0026quot;],null,null,null,1,null,null,null,null,null,1,null,[962575,982975,984457,970639,936524],null,[4,22,23,25,28,36,134545444,54,55,16842807,69,85,151,1,7,21,65557,131093,24,46,44,49,51,458803,57,58,72,82,84]],\u0026quot;5514502862557345524\u0026quot;,[\u0026quot;1846516188826553813\u0026quot;,\u0026quot;1\u0026quot;,null,null,\u0026quot;1793157765085968\u0026quot;],[\u0026quot;8159782437689136105\u0026quot;,\u0026quot;91978242\u0026quot;,\u0026quot;1793224353695144\u0026quot;],null,null,null,null,null,null,null,null,null,null,[null,93950000,111190000]]],\u0026quot;481\u0026quot;:[22]}],null,null,null,null,[null,null,\u0026quot;\/search?ibp\\u003doshop\\u0026prds\\u003dpvt:hg,pvo:29,mid:576462483921676311,imageDocid:17299193365165638268,gpcid:1846516188826553813,headlineOfferDocid:4753271733845577796,catalogid:5514502862557345524,productDocid:8159782437689136105,rds:PC_1846516188826553813%7CPROD_PC_1846516188826553813\\u0026q\\u003dproduct\u0026quot;]],0],\u0026quot;\u0026quot;,\u0026quot;\u0026quot;]--\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e is the \u003cmark class=\"b6AQX\" data-wiz-attrbind=\"class=q8GtUe_11\/cFwyDc\" data-sfc-root=\"c\" data-ved=\"2ahUKEwiu8ZjU5t2XAxVCMjQIHYwuFF8QuJAPeggIAggBCA4QAg\" data-complete=\"true\" data-sae=\"\"\u003eofficial replacement \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eStack Flue Sensor (SFS)\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e used in \u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003ePentair MasterTemp\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e (including MasterTemp 125, 200, 333, and 400) and \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eSta-Rite Max-E-Therm\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e gas pool and spa heaters\u003c!--TgQPHd|||[[[null,null,null,null,null,null,null,null,null,null,null,null,[247864,null,0]]]]--\u003e\u003c\/mark\u003e.\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgTEAA\" data-complete=\"true\" data-processed=\"true\"\u003eIt acts as a safety mechanism located on the heater's exhaust elbow, monitoring combustion exhaust temperatures to prevent the internal system from exceeding 500°F.\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e\n\u003cdiv class=\"ZLzG0d ncoeY E8xBUb\" role=\"heading\" aria-level=\"3\" data-animation-nesting=\"\" data-sfc-cp=\"\" data-wiz-attrbind=\"aria-level=q8GtUe_1m\/fLk2Md\" data-sfc-root=\"c\" data-complete=\"true\" data-sae=\"\"\u003eCommon Signs of Failure\u003c!--TgQPHd|||[[2,[null,null,null,null,null,null,null,null,null,null,null,null,[351768,null,0]],null,null,1]]--\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"XSq4R KI3fJ\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgXEAA\" data-complete=\"true\" data-processed=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgXEAM\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eE05 or E06 Error Codes:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e The most distinct sign of a bad sensor is an active \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eE05\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e (Stack Flue Sensor Fault) or \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eE06\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e error code on your heater's digital display board, which automatically shuts down the system for safety.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgXEAg\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eResistance Testing:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e You can verify if the sensor is bad using an ohm meter. A functioning sensor should read between \u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e3.5 to 4.0 megaohms\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e of resistance. If it reads completely open or sits outside this threshold, it needs to be replaced.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgXEA0\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eRoot Causes:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e If you swap the sensor and it fails again quickly, your heater may actually be overheating. This is frequently driven by internal calcium scale buildup in the heat exchanger or poor water circulation.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003c!--TgQPHd|||[]--\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"yhAwj\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\" data-sfc-inited=\"2\"\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/div\u003e\n\u003cdiv class=\"ZLzG0d ncoeY E8xBUb\" role=\"heading\" aria-level=\"3\" data-animation-nesting=\"\" data-sfc-cp=\"\" data-wiz-attrbind=\"aria-level=q8GtUe_2t\/fLk2Md\" data-sfc-root=\"c\" data-complete=\"true\" data-sae=\"\"\u003eHow to Replace It\u003c!--TgQPHd|||[[2,[null,null,null,null,null,null,null,null,null,null,null,null,[351768,null,0]],null,null,1]]--\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003e\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"n6owBd awi2gc\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgeEAA\" data-complete=\"true\" data-processed=\"true\"\u003eReplacing this sensor is a straightforward, drop-in repair that requires a ½-inch open-end wrench.\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/div\u003e\n\u003col class=\"T9WCjf qkgVBf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\" data-processed=\"true\"\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgiEAE\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eCut the power:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Turn off the filtration pump and completely disconnect the electrical power to the pool heater.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgiEAY\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eCool down:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Let the unit cool for at least 30 minutes.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgiEAs\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eOpen the casing:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Remove the upper jacket panels from the heater body to expose the internal wiring harness.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgiEBA\" data-complete=\"true\" data-sae=\"\"\u003e\n\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eSwap the hardware:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Disconnect the two red wire leads. Use your wrench to unscrew the old sensor counter-clockwise from the exhaust elbow.\u003c!--TgQPHd|||[]--\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003c!--TgQPHd|||[]--\u003e\n\u003c\/li\u003e\n\u003cli class=\"Z1qcYe\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-hveid=\"CAIIAQgiEBU\" data-complete=\"true\" data-sae=\"\"\u003e\u003cspan class=\"iNqyIf\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003e\u003cstrong class=\"rQesXe MPyX\" data-sfc-cp=\"\" data-sfc-root=\"c\" data-complete=\"true\"\u003eSeal \u0026amp; install:\u003c!--TgQPHd|||[]--\u003e\u003c\/strong\u003e Thread the new sensor in clockwise. It is highly recommended to apply a small bead of high-temperature RTV silicone sealant to the threads before installation to ensure a proper seal. Plug the wire leads back into the harness.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":68007649968378,"sku":"42002-0024S","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5854\/2074\/files\/PENTAIR42002-0024S.jpg?v=1793228005","url":"https:\/\/holidaypools.com\/products\/pentair-stack-flue-sensor-for-max-e-therm-and-mastertemp-heater-electrical-system-42002-0024s","provider":"My Store","version":"1.0","type":"link"}