{"product_id":"oem-goodman-150-f-primary-limit-switch-for-gmnt090-3b-b1370198","title":"OEM Goodman 150°F Primary Limit Switch for GMNT090-3B — B1370198","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B1370198 Primary High-Limit Switch\u003c\/strong\u003e is a genuine OEM safety control for the \u003cstrong\u003eGMNT090-3B\u003c\/strong\u003e gas furnace. Mounted on the heat-exchanger\/supply-air side, this primary limit opens at \u003cstrong\u003e150°F\u003c\/strong\u003e to shut off the burners if supply-air temperature climbs too high — protecting the heat exchanger from cracking due to restricted airflow. It is one of the furnace's most important safety devices.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart Number: B1370198\u003c\/li\u003e\n\u003cli\u003eType: Primary high-limit switch\u003c\/li\u003e\n\u003cli\u003eTrip Temperature: 150°F (open on rise, auto-reset)\u003c\/li\u003e\n\u003cli\u003eCompatible Model: GMNT090-3B (90,000 BTU furnace)\u003c\/li\u003e\n\u003cli\u003eBrand: Goodman (OEM)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eOEM B1370198\u003c\/strong\u003e is calibrated to Goodman's 150°F primary setpoint and the exact bracket used on the GMNT090-3B. Because the primary limit governs safe heat-rise, an off-spec generic switch can either short-cycle the burners or fail to protect the heat exchanger. Matching the OEM disc temperature and mounting position is essential. Repeated trips usually indicate an airflow restriction — inspect the filter, blower, and ductwork.\u003c\/p\u003e\u003ch3\u003eInstallation Difficulty: Easy\u003c\/h3\u003e\u003cp\u003eRated 2\/5. With power and gas off, remove the mounting screws, move the two spade connectors to the new switch, and remount it flush to the heat-exchanger panel. Typically a 10–15 minute job. Never bypass a primary limit switch.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058130043251,"sku":"GOODMAN-11694","price":12.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-150-f-primary-limit-switch-for-gmnt090-3b-b1370198","provider":"National HVAC Parts","version":"1.0","type":"link"}