{"product_id":"pentair-mastertemp-pool-heater-automatic-gas-shutoff-switch-42002-0025s","title":"Pentair MasterTemp Pool Heater Automatic Gas Shutoff Switch | 42002-0025S","description":"\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eProduct Overview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePentair Automatic Gas Shutoff Switch 42002-0025S\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a genuine OEM safety component designed for compatible \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePentair MasterTemp\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSta-Rite Max-E-Therm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e pool and spa heaters.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCommonly referred to as the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAGS switch\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, this component monitors heater operating temperature and helps protect the system from unsafe overheating conditions. If excessive temperature is detected, the switch interrupts heater operation to prevent continued firing until the underlying problem is corrected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA failed or tripped AGS switch may cause the heater to stop operating and display an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAGS-related fault or service-heater warning\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Because an AGS error can also be caused by restricted water flow, scale buildup, a damaged thermal regulator, bypass problems, or other heater conditions, the complete system should be professionally diagnosed before replacing the switch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eGenuine Pentair OEM replacement component\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic gas shutoff safety switch\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHelps protect the heater from excessive operating temperatures\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInterrupts heater operation when an unsafe condition is detected\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDesigned for compatible Pentair and Sta-Rite pool heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDirect replacement for the original factory-installed switch\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompact electrical safety component\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIntended for professional heater repair and servicing\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCompatible Heater Families\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis switch is commonly used with select models in the following heater families:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003ePentair MasterTemp pool and spa heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePentair MasterTemp HD heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePentair MasterTemp Low NOx heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSta-Rite Max-E-Therm pool and spa heaters\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCompatibility can vary according to heater model, production date, fuel type, and component configuration. Confirm the existing switch part number before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eSpecifications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePentair\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHeater Safety Switch\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eComponent Name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAutomatic Gas Shutoff Switch\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCommon Abbreviation\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAGS Switch\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSKU\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e\u003cspan\u003e42002-0025S\u003c\/span\u003e\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBarcode \/ UPC\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNot provided\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInstallation Location\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePool Heater\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFunction\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHigh-temperature safety shutdown\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHeater Compatibility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSelect MasterTemp and Max-E-Therm models\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFuel Compatibility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCompatible heater-dependent\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCondition\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNew\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eReplacement Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGenuine OEM Replacement Part\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eHow the AGS Switch Works\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe automatic gas shutoff switch is part of the heater’s safety circuit. It monitors temperature within the heater and opens the safety circuit when excessive heat is detected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen the AGS circuit opens, the heater may shut down and prevent the gas valve from continuing to operate. This protects internal components from damage caused by overheating or improper water circulation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe switch should not be bypassed, modified, or removed from the heater’s safety circuit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCommon Symptoms of an AGS-Related Problem\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eHeater displays an AGS fault\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eService Heater light is illuminated\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHeater begins firing and then shuts down\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHeater will not complete its ignition sequence\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHeater stops heating after operating briefly\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRepeated overheating or safety shutdowns\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNo continuity through the AGS switch after the heater cools\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAn AGS fault does not always mean that the switch itself has failed. The heater should also be inspected for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\u003cspan\u003eLow or restricted water flow\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDirty pool filter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClosed or partially closed valves\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eScale buildup inside the heat exchanger\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDamaged or sticking thermal regulator\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInternal bypass-valve problems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eImproper pump speed\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIncorrect plumbing configuration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eExcessive gas input or combustion problems\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eConfirm Before Ordering\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cspan\u003eVerify that the original switch is marked \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e42002-0025S\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConfirm the heater’s complete model and serial number.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDo not order solely based on an AGS fault code.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDiagnose water-flow and overheating conditions before replacing the switch.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDisconnect electrical power and gas supply before servicing the heater.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInstallation and diagnosis should be completed by a qualified pool-heater professional.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Information\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe heater must be completely shut down before servicing. Electrical power and gas supply should be disconnected according to the manufacturer’s service procedures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAfter installation, the technician should inspect the entire heater safety circuit, confirm proper water flow, and test heater operation. Replacing the AGS switch without correcting the condition that caused the overheating may result in another shutdown or damage to the heater.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNever bypass the AGS switch to keep the heater operating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eWarranty Information\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis genuine Pentair replacement part is covered according to Pentair’s applicable replacement-parts warranty terms. Warranty eligibility may depend on proper diagnosis, professional installation, correct application, and compliance with Pentair’s installation and service requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDamage caused by improper installation, bypassing safety controls, restricted water flow, scale buildup, incorrect water chemistry, or unauthorized heater modifications may not be covered.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cstrong\u003e\u003cspan\u003eCustomer-Facing Q\u0026amp;A\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eWhat does AGS mean on a Pentair MasterTemp heater?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eAGS stands for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAutomatic Gas Shutoff\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It is a safety circuit that shuts the heater down when an excessive-temperature condition is detected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eDoes an AGS error mean this switch is defective?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eNot necessarily. An AGS fault may also be caused by restricted water flow, a dirty filter, scale buildup, thermal-regulator failure, or internal bypass problems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eDoes this switch fit every MasterTemp heater?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eNo. Compatibility should be confirmed using the heater model, serial number, and the part number printed on the existing switch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eCan the AGS switch be bypassed?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eNo. The switch is a critical safety component and must never be bypassed or removed from the heater’s safety circuit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003e\u003cspan\u003eIs professional installation recommended?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes. Pool-heater safety controls should be diagnosed and replaced by a qualified pool and gas-heater technician.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003csection id=\"psd-manuals-sell-sheets\"\u003e\u003ch2\u003eManuals \u0026amp; Sell Sheets\u003c\/h2\u003e\n\u003cp\u003eManufacturer reference documents for this equipment family. Confirm your exact model and production revision before use.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/online.flippingbook.com\/view\/3145380\/\" target=\"_blank\" rel=\"noopener\"\u003eSell sheet: Brochure | Gas Pool Heaters Family Brochure\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/online.flippingbook.com\/view\/60126269\/\" target=\"_blank\" rel=\"noopener\"\u003eSell sheet: Brochure | MasterTemp High Performance Heaters\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pentair.com\/content\/dam\/extranet\/nam\/pentair-pool\/residential\/heaters\/mastertemp\/manual\/mastertemp-heater-manual-english.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: MasterTemp Installation and User's Guide - English\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pentair.com\/content\/dam\/extranet\/nam\/pentair-pool\/residential\/heaters\/mastertemp1\/mastertemp-max-e-therm-heater-direct-air-intake-duct-3-inch-pvc-pipe-kit-installation-instructions.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: MasterTemp and Max-E-Therm Direct Air Intake Duct Kit Installation Instructions\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pentair.com\/content\/dam\/extranet\/nam\/pentair-pool\/residential\/heaters\/heater-new-installation-checklist.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: Heater Checklist\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.pentair.com\/content\/dam\/extranet\/nam\/pentair-pool\/residential\/heaters\/mastertemp\/manual\/archive\/Pentair%20MasterTemp%20Heater%20Submittal%20Data.pdf\" target=\"_blank\" rel=\"noopener\"\u003eManual: Submittal Data\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/section\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":52762362118454,"sku":"PEN420020025S -H","price":54.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/1167\/9798\/files\/PEN420020025S_0_f3209897-d395-421e-9aeb-c51dd9a626f6.png?v=1755534903","url":"https:\/\/poolsupplydepot.net\/products\/pentair-mastertemp-pool-heater-automatic-gas-shutoff-switch-42002-0025s","provider":"Pool Supply Depot","version":"1.0","type":"link"}