{"product_id":"oem-lennox-limit-switch-49l87","title":"OEM Lennox Limit Switch — 49L87","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e49L87\u003c\/strong\u003e limit switch is a critical high-temperature safety control designed for Lennox furnaces and heating systems. It continuously monitors the temperature inside the heat exchanger or plenum and shuts down the burners if temperatures exceed safe operating limits — preventing overheating, cracked heat exchangers, and potential fire hazards. This factory component is calibrated to the precise trip point your Lennox equipment requires for proper, safe operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e If the \u003cstrong\u003e49L87\u003c\/strong\u003e fails, you may experience short cycling (the furnace repeatedly starting and stopping), the blower running continuously, no heat output, or the system locking out entirely. A worn or out-of-calibration limit switch can also trip prematurely on normal operating temperatures, leaving your home cold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox limit switches are calibrated to exact temperature thresholds matched to each furnace model. Installing a generic aftermarket switch risks incorrect trip points that either fail to protect the system or cause nuisance shutdowns. The OEM \u003cstrong\u003e49L87\u003c\/strong\u003e guarantees correct fit, factory-rated calibration, and full compatibility — restoring safe, reliable heating performance to your Lennox unit.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081104310643,"sku":"LNX-49L87","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-49L87.jpg?v=1783762563","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-49l87","provider":"National HVAC Parts","version":"1.0","type":"link"}