{"product_id":"oem-lennox-limit-switch-33j84","title":"OEM Lennox Limit Switch — 33J84","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33J84\u003c\/strong\u003e limit switch is a critical safety control in your Lennox gas or electric furnace. Mounted on the heat exchanger or in the plenum, it continuously monitors supply-air temperature and interrupts the burner or heating element if the furnace overheats — protecting the heat exchanger, wiring, and your home from dangerous conditions. This part is engineered to the exact temperature trip points Lennox specifies for your unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include short cycling (the furnace repeatedly starts and stops), the blower running continuously, no heat despite the burners igniting, or the system locking out on a limit fault. A limit switch that trips prematurely or fails open will prevent normal operation, while one stuck closed removes an essential safety layer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e the \u003cstrong\u003e33J84\u003c\/strong\u003e is calibrated to the precise open\/close temperatures and physical mounting of your Lennox furnace. Universal or aftermarket switches with the wrong trip point can allow overheating or cause nuisance shutdowns. Choosing the factory-specified Lennox part ensures correct fit, reliable protection, and continued compliance with your equipment's design ratings.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108898163,"sku":"LNX-33J84","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-33J84.jpg?v=1783762516","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-33j84","provider":"National HVAC Parts","version":"1.0","type":"link"}