{"product_id":"oem-lennox-limit-switch-75w15","title":"OEM Lennox Limit Switch — 75W15","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e75W15\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your Lennox furnace heat exchanger. When temperatures climb above the safe threshold, the \u003cstrong\u003e75W15\u003c\/strong\u003e interrupts the burner circuit to prevent overheating, then automatically resets once conditions return to normal. It ensures the blower and burners cycle correctly to protect the heat exchanger and your home.\u003c\/p\u003e\u003cp\u003eCommon symptoms of a failing limit switch include a furnace that short-cycles, shuts off before reaching the set temperature, trips on high limit repeatedly, or refuses to fire at all. A switch that sticks open leaves you with no heat, while one that sticks closed removes an important safety layer against overheating.\u003c\/p\u003e\u003cp\u003eInstalling an OEM Lennox limit switch matters because the \u003cstrong\u003e75W15\u003c\/strong\u003e is calibrated to the exact trip and reset temperatures your specific furnace model requires. Generic replacements with the wrong temperature rating can nuisance-trip or, worse, fail to protect the heat exchanger. Match the factory-spec part for safe, reliable operation and correct furnace sequencing all season long.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081132687731,"sku":"LNX-75W15","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-75W15.jpg?v=1783762609","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-75w15","provider":"National HVAC Parts","version":"1.0","type":"link"}