{"product_id":"oem-lennox-limit-switch-27k79","title":"OEM Lennox Limit Switch — 27K79","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e27K79\u003c\/strong\u003e limit switch is a critical safety control installed on Lennox gas and electric furnaces. It continuously monitors the temperature inside the heat exchanger or plenum and automatically shuts off the burners if the unit overheats, protecting your furnace and home from damage caused by restricted airflow or a failing blower. This factory-spec component is engineered to trip at the exact temperature threshold your Lennox system was designed around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include a furnace that short-cycles (turning on and off repeatedly), no heat output, a blower that runs continuously, or a system that locks out entirely. A limit switch that has drifted out of calibration or failed open will interrupt the ignition sequence and leave your home cold, often accompanied by a fault code on the control board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Aftermarket limit switches frequently trip at incorrect temperatures, causing nuisance shutdowns or, worse, failing to protect against a genuine overheat condition. The Lennox \u003cstrong\u003e27K79\u003c\/strong\u003e is calibrated to precise factory specifications, guaranteeing correct operation, proper fit, and full compatibility with your Lennox furnace's safety circuit.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081110471027,"sku":"LNX-27K79","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-27K79.jpg?v=1783762497","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-27k79","provider":"National HVAC Parts","version":"1.0","type":"link"}