{"product_id":"oem-lennox-furnace-limit-switch-69w37","title":"OEM Lennox Furnace Limit Switch — 69W37","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e69W37\u003c\/strong\u003e limit switch is a high-temperature safety control that keeps your Lennox furnace operating within safe limits. Mounted on the heat exchanger or plenum, it senses supply-air temperature and interrupts the burner circuit whenever the unit overheats, protecting the heat exchanger and preventing hazardous operating conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e69W37\u003c\/strong\u003e fails, you may notice the furnace short cycling, no heat despite an ignition attempt, the blower running continuously, or a limit-open fault displayed by the control board. A switch that has opened permanently will prevent the burners from firing, leaving you without heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e69W37\u003c\/strong\u003e is calibrated to a precise temperature set point matched to your specific Lennox furnace. Only the factory OEM part guarantees the correct trip range, sensor accuracy, and exact fitment — ensuring safe, code-compliant operation and avoiding the nuisance trips or safety gaps common with mismatched generic replacements.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097757043,"sku":"LNX-69W37","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-69W37.jpg?v=1783761144","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-furnace-limit-switch-69w37","provider":"National HVAC Parts","version":"1.0","type":"link"}