{"product_id":"oem-lennox-limit-switch-35k61","title":"OEM Lennox Limit Switch — 35K61","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e35K61\u003c\/strong\u003e limit switch is a critical high-temperature safety control used in Lennox gas and electric furnaces. It continuously monitors the temperature inside the heat exchanger compartment and interrupts the burner or heating element if the unit exceeds its safe operating limit, protecting your equipment and home from overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e If the \u003cstrong\u003e35K61\u003c\/strong\u003e fails, you may experience a furnace that short-cycles (turns on and off repeatedly), a blower that runs constantly, no heat output, or the unit locking out on a limit fault. A switch that trips prematurely or stays open is a common cause of intermittent no-heat calls.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Limit switches are precision-calibrated to a specific trip temperature for each Lennox furnace model. An OEM \u003cstrong\u003e35K61\u003c\/strong\u003e guarantees the exact factory temperature rating, terminal configuration, and mounting fit — aftermarket substitutes risk nuisance trips or, worse, failure to trip when it counts. Protect your Lennox system's safety chain with the correct factory part.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108210035,"sku":"LNX-35K61","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-35K61.jpg?v=1783762521","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-35k61","provider":"National HVAC Parts","version":"1.0","type":"link"}