{"product_id":"oem-lennox-limit-switch-11w51","title":"OEM Lennox Limit Switch — 11W51","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e11W51\u003c\/strong\u003e limit switch is a temperature-activated safety device that protects your Lennox furnace from overheating. Mounted in the heat exchanger or plenum area, it continuously senses the supply air temperature and interrupts power to the burners the moment conditions exceed the factory-set safe limit. This ensures your furnace never operates in an unsafe overheat condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e11W51\u003c\/strong\u003e fails, you may experience short-cycling, a furnace that ignites and then quickly shuts down, no heat output, or repeated safety lockouts. A switch that has drifted out of calibration can trip too early during normal operation or, worse, fail to trip when it should.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox engineers the \u003cstrong\u003e11W51\u003c\/strong\u003e to a precise trip temperature and mounting specification. Generic substitutes risk nuisance faults or bypassing critical overheat protection. Choosing the genuine OEM part guarantees exact compatibility, proper calibration, and the long-term reliability your Lennox system demands.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081115812211,"sku":"LNX-11W51","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-11W51.jpg?v=1783762459","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-11w51","provider":"National HVAC Parts","version":"1.0","type":"link"}