{"product_id":"oem-lennox-furnace-limit-switch-19m00","title":"OEM Lennox Furnace Limit Switch — 19M00","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e19M00\u003c\/strong\u003e limit switch is a critical safety control in your Lennox gas furnace. Mounted on the heat exchanger or plenum, it continuously monitors supply-air temperature and cuts power to the gas valve if the furnace overheats — protecting the heat exchanger, wiring, and your home from dangerous high-temperature conditions. It is built to the exact temperature calibration Lennox specifies for the 19M00 application.\u003c\/p\u003e\u003cp\u003eA failing limit switch produces telltale symptoms: the furnace short-cycles, shuts off before reaching the set temperature, trips repeatedly on high limit, or fails to fire because the switch is stuck open. A limit that stays closed when it should open is a serious safety concern, allowing the furnace to run past safe temperatures.\u003c\/p\u003e\u003cp\u003eOEM matters here more than almost anywhere else. The \u003cstrong\u003e19M00\u003c\/strong\u003e is calibrated to trip at a precise temperature threshold matched to your furnace's design. A substitute switch with the wrong rating can either nuisance-trip or, worse, fail to protect the equipment. Installing the factory part restores proper overheat protection and reliable heating.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081113452915,"sku":"LNX-19M00","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-snap-disc-LNX-19M00.jpg?v=1783761134","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-furnace-limit-switch-19m00","provider":"National HVAC Parts","version":"1.0","type":"link"}