{"product_id":"oem-lennox-limit-switch-38m68","title":"OEM Lennox Limit Switch — 38M68","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e38M68\u003c\/strong\u003e limit switch is a high-temperature safety control that safeguards your Lennox furnace against overheating. Positioned near the heat exchanger, it senses plenum temperature and interrupts the burner circuit whenever the furnace exceeds its safe operating range — typically the result of poor airflow from a clogged filter, a weak blower motor, or closed and blocked registers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace repeatedly ignites and then shuts down after a short run, heating short-cycles, the system delivers no heat, or the blower will not stop running. When the \u003cstrong\u003e38M68\u003c\/strong\u003e fails open it locks the furnace out of heating; when it fails closed it can no longer protect the heat exchanger from cracking under excess heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e38M68\u003c\/strong\u003e is set to the precise trip and reset temperatures engineered for your specific model. Aftermarket switches with incorrect ratings risk unsafe overheating or endless nuisance trips. Installing the factory-spec part ensures accurate calibration, a proper mechanical and electrical fit, and dependable protection for your family and your Lennox system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107456371,"sku":"LNX-38M68","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-38M68.jpg?v=1783762542","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-38m68","provider":"National HVAC Parts","version":"1.0","type":"link"}