{"product_id":"oem-lennox-limit-switch-33j34","title":"OEM Lennox Limit Switch — 33J34","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33J34\u003c\/strong\u003e limit switch is a high-limit safety control for Lennox furnaces. Positioned to read the temperature of air moving across the heat exchanger, it automatically de-energizes the burner or heating element if the furnace overheats, protecting the heat exchanger and preventing unsafe operating conditions. The \u003cstrong\u003e33J34\u003c\/strong\u003e is calibrated to the precise trip and reset temperatures Lennox specifies for your equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include short cycling, burners that ignite then shut off almost immediately, a blower that never stops, no heat on a call, or a limit-fault lockout on the control board. A limit switch that has drifted out of calibration will trip early and interrupt heating, while one that fails closed eliminates a key safety safeguard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e as a safety-critical control, the \u003cstrong\u003e33J34\u003c\/strong\u003e must match its exact temperature ratings, terminal configuration, and mounting to function correctly. Generic replacements with different trip points can cause nuisance shutdowns or allow dangerous overheating. The factory Lennox part restores proper protection and reliable performance for your system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108996467,"sku":"LNX-33J34","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-33J34.jpg?v=1783762511","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-33j34","provider":"National HVAC Parts","version":"1.0","type":"link"}