{"product_id":"oem-lennox-furnace-limit-switch-27j29","title":"OEM Lennox Furnace Limit Switch — 27J29","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e27J29\u003c\/strong\u003e limit switch is a critical safety control that monitors internal furnace temperature and shuts down the burners if the heat exchanger area exceeds its safe operating threshold. Calibrated to the exact trip and reset points specified by Lennox, it protects your equipment and home from dangerous overheating caused by restricted airflow or blower failure.\u003c\/p\u003e\u003cp\u003eA failing limit switch often reveals itself through short cycling, where the furnace ignites and then shuts off prematurely, no heat output, the blower running continuously, or nuisance lockouts on the control board. A switch that trips too early or sticks open can leave you without heat, while one that fails to open removes an essential layer of protection.\u003c\/p\u003e\u003cp\u003eUsing the OEM Lennox \u003cstrong\u003e27J29\u003c\/strong\u003e is essential because its temperature calibration and mounting are designed specifically for your furnace model. Generic limit switches with incorrect trip ranges can allow unsafe operation or cause frustrating false trips. Installing the factory part restores proper safety response and reliable heating. In stock and ships same day when ordered before 3PM CST.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081110634867,"sku":"LNX-27J29","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-27J29.jpg?v=1783761137","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-furnace-limit-switch-27j29","provider":"National HVAC Parts","version":"1.0","type":"link"}