{"product_id":"oem-lennox-limit-switch-71j07","title":"OEM Lennox Limit Switch — 71J07","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e71J07\u003c\/strong\u003e high-limit switch is a temperature-sensing safety control that protects your furnace from overheating. Mounted near the heat exchanger, it monitors supply-air temperature and cuts power to the burners if it climbs too high — a common condition when airflow is restricted by a dirty filter, blocked ducts, or a failing blower motor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace short cycles, the blower runs while the burners stay off, the unit produces no heat, or it repeatedly trips on a limit fault. A switch that opens prematurely or fails closed compromises the safety of the entire heating system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e the \u003cstrong\u003e71J07\u003c\/strong\u003e is calibrated to the exact open and reset temperatures your Lennox furnace requires. A generic limit switch with a different trip point can allow dangerous overheating or cause needless shutdowns. Choosing the OEM part guarantees the correct setpoint, mounting fit, and terminal configuration — restoring safe, reliable overheat protection.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097232755,"sku":"LNX-71J07","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-71J07.jpg?v=1783762594","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-71j07","provider":"National HVAC Parts","version":"1.0","type":"link"}