{"product_id":"oem-lennox-limit-switch-47l18","title":"OEM Lennox Limit Switch — 47L18","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e47L18\u003c\/strong\u003e limit switch is a critical safety control in your furnace or air handler. It continuously monitors the temperature inside the heat exchanger and shuts the burners off if the unit overheats — protecting the heat exchanger, wiring, and surrounding components from heat damage. This factory-spec switch is calibrated to the exact trip and reset temperatures your Lennox equipment was engineered for.\u003c\/p\u003e\u003cp\u003eWhen a limit switch fails or drifts out of calibration, you'll often notice the furnace short-cycling (turning on and off repeatedly), the blower running continuously, no heat at all, or the system locking out on a safety fault. A worn switch may also trip prematurely on normal heating cycles, leaving your home cold.\u003c\/p\u003e\u003cp\u003eInstalling an OEM Lennox \u003cstrong\u003e47L18\u003c\/strong\u003e matters because aftermarket limit switches frequently use different temperature ratings or mounting geometry, which can cause nuisance trips or, worse, fail to open when the system genuinely overheats. The OEM part guarantees correct set points, proper fit, and reliable protection for your Lennox system.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081104998771,"sku":"LNX-47L18","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-47L18.jpg?v=1783762553","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-47l18","provider":"National HVAC Parts","version":"1.0","type":"link"}