{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-gks91155dxaa-20162906","title":"OEM Goodman M4 Primary High Limit Switch for GKS91155DXAA — 20162906","description":"\u003ch2\u003eGoodman 20162906 M4 Primary Limit Switch\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eGoodman 20162906 M4 primary limit switch\u003c\/strong\u003e is a genuine OEM overheat safety control for the \u003cstrong\u003eGoodman GKS91155DXAA\u003c\/strong\u003e gas furnace. Mounted on the heat exchanger\/plenum, this normally-closed thermal switch opens the gas valve circuit if supply-air temperature climbs too high — protecting the furnace and home from overheating caused by dirty filters, blocked ducts, or blower failure. A failed limit switch causes short cycling, no heat, or nuisance lockouts.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit switch (M4 series)\u003c\/li\u003e\n\u003cli\u003eFunction: Normally-closed, opens on over-temperature\u003c\/li\u003e\n\u003cli\u003eApplication: Heat-exchanger \/ plenum overheat protection\u003c\/li\u003e\n\u003cli\u003eFits: Goodman GKS91155DXAA gas furnace\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eLimit switches are calibrated to a specific trip temperature matched to the furnace's heat-exchanger design. Genuine OEM units carry the correct cut-out point and mounting geometry; generic switches may trip early, late, or not at all — a serious safety concern. For a safety control, OEM is strongly recommended.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty: Moderate\u003c\/h3\u003e\u003cp\u003ePower down the furnace, remove the two mounting screws, transfer the spade connectors, and reinstall. A DIY-capable owner can manage it, but confirm correct part fit and never bypass a limit switch.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057147101555,"sku":"GOODMAN-20162906","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-gks91155dxaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}