{"product_id":"oem-lennox-limit-switch-27k16","title":"OEM Lennox Limit Switch — 27K16","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e27K16\u003c\/strong\u003e limit switch is a temperature-activated safety control that safeguards your Lennox furnace against overheating. Mounted on the heat exchanger or in the plenum, it senses supply-air temperature and cuts power to the burners the moment heat climbs above the safe threshold — a condition typically caused by a dirty filter, closed vents, or a struggling blower. It is a small but essential guardian of both your equipment and your home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include a furnace that short-cycles on and off, intermittent or no heat, a blower that runs nonstop, or a control board reporting an open-limit fault. When this switch fails open or drifts out of calibration, it interrupts the heating sequence and prevents the burners from firing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e A limit switch is only effective when it trips at precisely the right temperature. Generic replacements often open too early, causing nuisance lockouts, or too late, defeating their protective purpose. The Lennox \u003cstrong\u003e27K16\u003c\/strong\u003e is factory-calibrated to your furnace's exact specifications, ensuring dependable safety operation and a perfect fit within the Lennox control circuit.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081110536563,"sku":"LNX-27K16","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-27K16.jpg?v=1783762496","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-27k16","provider":"National HVAC Parts","version":"1.0","type":"link"}