{"product_id":"oem-lennox-limit-switch-74w76","title":"OEM Lennox Limit Switch — 74W76","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e74W76\u003c\/strong\u003e limit switch is a high-temperature safety control that protects your furnace from overheating. Mounted on the heat exchanger or in the blower compartment, it continuously monitors internal temperature and opens the circuit to shut off the burners if heat rises above a safe threshold — most often caused by restricted airflow. It is calibrated to the exact trip and reset temperatures specified for your Lennox furnace.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A malfunctioning 74W76 limit switch can cause the furnace to short cycle, shut down prematurely on heat calls, or fail to fire at all. You may notice the burners lighting and then cutting out, the blower running continuously, or a limit-fault code. Dirty filters, a blocked coil, or a failing blower motor frequently push the switch to trip and can accelerate its wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Limit switches are a life-safety device set to a precise temperature rating. Installing a generic switch with the wrong trip point can either allow dangerous overheating or cause constant nuisance shutdowns. The OEM Lennox \u003cstrong\u003e74W76\u003c\/strong\u003e guarantees the correct temperature calibration, mounting fit, and terminal configuration, restoring proper overheat protection and reliable furnace operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081095790963,"sku":"LNX-74W76","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-74W76.jpg?v=1783762604","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-74w76","provider":"National HVAC Parts","version":"1.0","type":"link"}