{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-gks91155dxag-20162906","title":"OEM Goodman M4 Primary High-Limit Switch for GKS91155DXAG — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe Goodman \u003cstrong\u003e20162906\u003c\/strong\u003e is a genuine OEM M4 primary high-limit switch for the \u003cstrong\u003eGKS91155DXAG\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger bulkhead, this primary limit continuously monitors supply-air temperature and opens the control circuit if the furnace overheats — most often due to restricted airflow from a clogged filter, closed registers, or a weak blower. By cutting the burners while the blower continues to run, it protects the heat exchanger from thermal damage and prevents unsafe operating temperatures.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eType: M4 primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eFunction: Normally-closed thermal safety cutout (auto-reset)\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4 in. quick-connect spade\u003c\/li\u003e\n\u003cli\u003eMounting: Heat-exchanger bulkhead, OEM bracket\u003c\/li\u003e\n\u003cli\u003eFits: Goodman\/Amana GKS91155DXAG and compatible GKS9 series\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Goodman OEM\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 is factory-calibrated to the precise limit temperature and insertion depth this furnace demands. Universal limit switches with adjustable or approximate set points risk nuisance lockouts or inadequate protection. For a primary safety control, the genuine Goodman part is the reliable choice.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Typically 10–15 minutes: disconnect power and gas, photograph the wiring, remove the two spade terminals, unscrew the limit from the bulkhead, and install the replacement at the same depth. Always correct any airflow restriction that caused the furnace to overheat before returning it to service.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eCompatibility note: Verify your furnace model and original part number before purchase. Fits Goodman GKS91155DXAG.\u003c\/em\u003e\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058107531635,"sku":"GOODMAN-20162906","price":22.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-gks91155dxag-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}