{"product_id":"oem-goodman-170-f-primary-limit-switch-for-amh80904bnac-b1370188","title":"OEM Goodman 170°F Primary Limit Switch for AMH80904BNAC — B1370188","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370188\u003c\/strong\u003e is a genuine OEM primary limit switch rated at \u003cstrong\u003e170°F\u003c\/strong\u003e for the \u003cstrong\u003eAMH80904BNAC\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. Mounted on the heat exchanger\/burner bulkhead, the primary limit monitors supply-air temperature and opens the gas valve circuit if the furnace overheats from low airflow — a dirty filter, failed blower, or closed registers. It also signals the blower to run, making it central to normal heating operation and safety.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTrip temperature: 170°F (open on rise, auto reset)\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eFunction: Heat-exchanger over-temperature protection and blower control\u003c\/li\u003e\n\u003cli\u003eFit: Goodman AMH80904BNAC and compatible furnaces\u003c\/li\u003e\n\u003cli\u003eOEM part number: B1370188\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM Goodman\u003c\/strong\u003e primary limit is calibrated to the precise 170°F set point and insertion depth the furnace was engineered around. Because it governs both safety and blower timing, we strongly recommend the OEM part over generic alternatives that may differ in set point, probe length, or bracket.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eEasy (2\/5).\u003c\/strong\u003e Turn off power, remove the two mounting screws, transfer the wire connectors, and seat the new switch flush in the same opening. Replace the air filter and verify airflow to prevent repeat trips.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057632690547,"sku":"GOODMAN-B1370188","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-170-f-primary-limit-switch-for-amh80904bnac-b1370188","provider":"National HVAC Parts","version":"1.0","type":"link"}