{"product_id":"oem-lennox-high-limit-switch-26h66","title":"OEM Lennox High Limit Switch — 26H66","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e26H66\u003c\/strong\u003e high limit switch is a temperature-sensing safety control that guards your furnace against overheating. Mounted near the heat exchanger, it monitors plenum temperature and shuts off the gas valve if the furnace runs too hot — protecting the heat exchanger, blower components, and your home from heat-related damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e26H66\u003c\/strong\u003e fails or trips, the furnace often produces no heat, short-cycles on and off, or shuts down after a few minutes of operation. Overheating from a dirty filter, blocked ductwork, or a failing blower motor can repeatedly trip the limit, and a switch that has opened permanently will keep the burners locked out until it is replaced.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e26H66\u003c\/strong\u003e is calibrated to the exact open and close temperatures and the mounting configuration Lennox specifies for your furnace. A generic limit with the wrong trip point may allow dangerous overheating or cause constant nuisance shutdowns. Installing the factory OEM switch restores accurate overheat protection and the safe, reliable operation your Lennox furnace was designed to deliver.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081111355763,"sku":"LNX-26H66","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-26H66.jpg?v=1783761965","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-high-limit-switch-26h66","provider":"National HVAC Parts","version":"1.0","type":"link"}