{"product_id":"oem-lennox-limit-switch-36k30","title":"OEM Lennox Limit Switch — 36K30","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e36K30\u003c\/strong\u003e limit switch is a temperature-sensing safety control that protects your furnace from overheating. Mounted on the heat exchanger or plenum, it continuously monitors supply air temperature and shuts off the gas valve if the furnace exceeds its safe operating limit — typically caused by restricted airflow or blower failure. This ensures your Lennox equipment operates within its designed temperature range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A faulty \u003cstrong\u003e36K30\u003c\/strong\u003e can trip prematurely, causing the furnace to short cycle, or fail to reset and prevent the burners from firing at all. You may notice the blower running continuously, no heat output, or a limit switch open fault code on the control board.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e36K30\u003c\/strong\u003e is calibrated to a precise trip temperature specific to your Lennox model. Generic replacements with incorrect ratings can cause nuisance shutdowns or fail to protect the heat exchanger, risking cracks and dangerous conditions. Choosing the OEM part guarantees the correct temperature setpoint and a direct fit.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107980659,"sku":"LNX-36K30","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-36K30.jpg?v=1783762528","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-36k30","provider":"National HVAC Parts","version":"1.0","type":"link"}