{"product_id":"oem-lennox-limit-switch-79j63","title":"OEM Lennox Limit Switch — 79J63","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e79J63\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your furnace's heat exchanger. If the unit overheats — typically due to restricted airflow or blower issues — this switch opens the circuit to shut off the burners, protecting the heat exchanger from cracking and preventing a potential fire hazard.\u003c\/p\u003e\u003cp\u003eSymptoms of a faulty limit switch include the furnace short cycling, the blower running non-stop, no heat output, or the system tripping into lockout. A switch that opens prematurely or fails closed can leave your Lennox furnace either inoperable or unsafe.\u003c\/p\u003e\u003cp\u003eOEM matters here more than anywhere: the \u003cstrong\u003e79J63\u003c\/strong\u003e is calibrated to the exact trip and reset temperatures specified for your Lennox model. A generic switch with the wrong temperature rating can allow dangerous overheating or cause constant nuisance shutdowns. Install the factory part for correct, code-compliant protection.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081133932915,"sku":"LNX-79J63","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-79J63.jpg?v=1783762612","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-79j63","provider":"National HVAC Parts","version":"1.0","type":"link"}