{"product_id":"oem-lennox-limit-switch-48j72","title":"OEM Lennox Limit Switch — 48J72","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e48J72\u003c\/strong\u003e limit switch is a temperature-sensing safety control that guards your Lennox furnace against overheating. Positioned on the heat exchanger or plenum, it opens the burner circuit the moment supply-air temperature climbs past a safe threshold — most often triggered by restricted airflow from a dirty filter or a failing blower.\u003c\/p\u003e\u003cp\u003eA worn or out-of-spec limit switch commonly causes short-cycling, the blower running continuously, no heat output, or repeated safety lockouts. A switch that trips prematurely or fails to reset is a clear sign it needs replacement.\u003c\/p\u003e\u003cp\u003eThe OEM \u003cstrong\u003e48J72\u003c\/strong\u003e is calibrated to the precise open and close temperatures your Lennox system was designed around. Aftermarket limits with different trip points can cause nuisance shutdowns or fail to protect the heat exchanger. This direct factory replacement guarantees accurate calibration, correct fit, and safe operation for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081104671091,"sku":"LNX-48J72","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-48J72.jpg?v=1783762558","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-48j72","provider":"National HVAC Parts","version":"1.0","type":"link"}