{"product_id":"oem-lennox-limit-switch-38m67","title":"OEM Lennox Limit Switch — 38M67","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e38M67\u003c\/strong\u003e limit switch is a temperature-activated safety device that protects your Lennox furnace from dangerous overheating. Mounted at the heat exchanger or plenum, it opens the burner control circuit the moment internal temperatures rise above the safe threshold — a situation most often triggered by restricted airflow, a dirty filter, or a struggling blower motor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace short-cycles during a heat call, burners light and then cut off prematurely, there is no heat output, or the blower runs nonstop. A \u003cstrong\u003e38M67\u003c\/strong\u003e that fails in the open position prevents the furnace from heating, while one stuck closed leaves the heat exchanger unprotected against overheating and cracking.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e38M67\u003c\/strong\u003e is factory-calibrated to the exact open and close temperatures your furnace requires. Generic replacements with mismatched temperature ratings can permit unsafe conditions or cause frustrating nuisance lockouts. The OEM part delivers correct calibration, exact fit, and the reliable safety performance Lennox engineered into your system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107489139,"sku":"LNX-38M67","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-38M67.jpg?v=1783762540","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-38m67","provider":"National HVAC Parts","version":"1.0","type":"link"}