{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80805cxaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80805CXAA — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 Primary Limit Switch\u003c\/strong\u003e is a genuine OEM high-limit safety control for the Amana\/Goodman \u003cstrong\u003eAMH80805CXAA\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger bulkhead, this primary limit continuously monitors supply-air temperature. If the furnace overheats — commonly from a dirty filter, blocked ductwork, or a failed blower — the switch opens to shut down the gas valve and protect the heat exchanger from cracking. It is a snap-disc, auto-reset device that re-closes once temperatures return to a safe range.\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, opens on over-temperature\u003c\/li\u003e\n\u003cli\u003eReset: Automatic (snap-disc)\u003c\/li\u003e\n\u003cli\u003eTerminals: 1\/4\" quick-connect spade\u003c\/li\u003e\n\u003cli\u003eFits: Goodman \u0026amp; Amana gas furnaces including AMH80805CXAA\u003c\/li\u003e\n\u003cli\u003eOEM Part Number: 20162906\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 carries the exact cut-out temperature and mounting footprint Goodman specified for the AMH80805CXAA. Substituting a universal limit with a different trip point or L-number can cause nuisance shutdowns or, worse, allow the furnace to over-fire. For a life-safety control, the genuine part is the right call.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (1\/5).\u003c\/strong\u003e Typically two mounting screws and two spade connectors — most DIYers finish in about 10 minutes. Turn off power and gas, let the furnace cool, and match the wire terminals before removing the old switch.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057626530163,"sku":"GOODMAN-5647","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80805cxaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}