{"product_id":"oem-lennox-limit-switch-83l89","title":"OEM Lennox Limit Switch — 83L89","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e83L89\u003c\/strong\u003e limit switch is a factory-calibrated safety device for your Lennox gas furnace. Positioned to sense heat exchanger temperature, it opens the control circuit and shuts down the burners the moment temperatures exceed safe limits, guarding against overheating caused by restricted airflow or blower problems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failing \u003cstrong\u003e83L89\u003c\/strong\u003e often shows up as a furnace that heats briefly then shuts off, repeated short cycling, blower running without heat, or nuisance lockouts on cold days. Because the switch is a wear item, its trip point can drift over time and cause erratic operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The precise trip temperature and terminal configuration of the \u003cstrong\u003e83L89\u003c\/strong\u003e are matched to your specific Lennox furnace. Choosing the genuine OEM part guarantees the correct setpoint, dependable safety shutoff, and a drop-in fit — avoiding the miscalibration and premature failures common with universal substitutes.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081093824883,"sku":"LNX-83L89","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-83L89.jpg?v=1783762621","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-83l89","provider":"National HVAC Parts","version":"1.0","type":"link"}