{"product_id":"oem-lennox-limit-switch-49l86","title":"OEM Lennox Limit Switch — 49L86","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e49L86\u003c\/strong\u003e limit switch is a high-temperature safety device built for Lennox furnaces and heating systems. It monitors heat exchanger and plenum temperatures and automatically de-energizes the burners whenever the system runs hotter than its safe threshold — protecting against overheating, heat exchanger damage, and fire risk. Each switch is factory-calibrated to the specific trip temperature your Lennox model was engineered to use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing \u003cstrong\u003e49L86\u003c\/strong\u003e often causes the furnace to short cycle, the blower to run non-stop, or the unit to produce no heat at all. When the switch drifts out of calibration, it may trip on normal operating temperatures — resulting in nuisance lockouts and inconsistent comfort throughout your home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The safety function of a limit switch depends entirely on its precise calibration. Generic replacements frequently use different trip points that either compromise protection or trigger false shutdowns. Choosing the OEM Lennox \u003cstrong\u003e49L86\u003c\/strong\u003e ensures an exact fit, factory-rated temperature setpoint, and guaranteed compatibility with your equipment — keeping your Lennox furnace running safely and efficiently.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081104343411,"sku":"LNX-49L86","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-49L86.jpg?v=1783762562","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-49l86","provider":"National HVAC Parts","version":"1.0","type":"link"}