{"product_id":"oem-lennox-limit-switch-36m63","title":"OEM Lennox Limit Switch — 36M63","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e36M63\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your Lennox furnace and shuts off the burners if the heat exchanger gets too hot. Calibrated to Lennox's precise trip and reset points, it protects your equipment and home from overheating while allowing normal heating cycles to run uninterrupted.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When a limit switch fails or drifts out of calibration, you may see the furnace short-cycling, the burners lighting then shutting off quickly, no heat with the blower running continuously, or a persistent limit-related fault code. A switch stuck open blocks ignition entirely, while a lazy switch can allow unsafe temperatures.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Limit switches are a safety device, and the trip temperature must match your furnace exactly. The factory-specified \u003cstrong\u003e36M63\u003c\/strong\u003e carries the correct rating, sensor length, and mounting for your Lennox model — a mismatched aftermarket switch can nuisance-trip or, worse, fail to protect the unit. Keep your furnace safe with the part Lennox engineered for it. In stock and ready to ship same day.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081107882355,"sku":"LNX-36M63","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-limit-switch-rollout-LNX-36M63.jpg?v=1783762532","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-36m63","provider":"National HVAC Parts","version":"1.0","type":"link"}