{"product_id":"oem-lennox-limit-switch-11w52","title":"OEM Lennox Limit Switch — 11W52","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e11W52\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your furnace's heat exchanger compartment. When the air temperature climbs above a safe threshold, the switch opens the circuit to shut down the burners, protecting your Lennox furnace and heat exchanger from dangerous overheating. This factory-specified component is calibrated to the exact trip point your system requires for safe, efficient operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A faulty \u003cstrong\u003e11W52\u003c\/strong\u003e may cause the furnace to short-cycle (turning on and off repeatedly), fail to fire at all, or trip prematurely and leave you without heat. A limit switch that is stuck open will lock out the burners, while one stuck closed defeats the safety function entirely — a serious hazard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Aftermarket limit switches often use incorrect trip temperatures or mounting geometry, which can lead to nuisance shutdowns or compromised safety. Installing the genuine Lennox \u003cstrong\u003e11W52\u003c\/strong\u003e guarantees the correct calibration, fit, and reliability your Lennox equipment was engineered for, keeping your warranty and safety protections intact.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081115779443,"sku":"LNX-11W52","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-11W52.jpg?v=1783762461","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-11w52","provider":"National HVAC Parts","version":"1.0","type":"link"}