{"product_id":"oem-lennox-limit-switch-27k12","title":"OEM Lennox Limit Switch — 27K12","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e27K12\u003c\/strong\u003e limit switch is a high-limit safety control that protects your Lennox furnace from dangerous overheating. It monitors the temperature at the heat exchanger and instantly de-energizes the burners if the unit exceeds its safe operating range, guarding against the airflow restrictions and blower problems that can crack a heat exchanger or create a fire hazard. This factory component is calibrated to the exact trip point your Lennox system was engineered to use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include repeated short-cycling, loss of heat, a blower motor that never shuts off, or a furnace that locks out and displays a limit-circuit error. A worn or out-of-spec switch will break the control circuit and stop the ignition sequence, leaving your home without heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The precise trip temperature is what makes a limit switch safe and reliable — aftermarket units often lack correct calibration, leading to false trips or inadequate protection. The Lennox \u003cstrong\u003e27K12\u003c\/strong\u003e meets original factory specifications for temperature threshold, terminal configuration, and mounting, ensuring seamless compatibility and trustworthy safety performance in your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081110569331,"sku":"LNX-27K12","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-27K12.jpg?v=1783762494","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-27k12","provider":"National HVAC Parts","version":"1.0","type":"link"}