{"product_id":"oem-lennox-limit-switch-71w43","title":"OEM Lennox Limit Switch — 71W43","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e71W43\u003c\/strong\u003e limit switch is a critical safety control mounted on the heat exchanger of your Lennox gas furnace. It continuously monitors supply-air temperature and interrupts the burner circuit if the furnace overheats, protecting the heat exchanger and your home from damage. This factory replacement is calibrated to the exact trip point your Lennox system was engineered for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace short-cycles (burner lights then quickly shuts off), the blower runs continuously, you get no heat despite a call for heat, or the control board logs a limit-open fault. A weak or open limit switch is one of the most frequent causes of nuisance lockouts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e aftermarket limit switches often have incorrect temperature ratings or manual-reset behavior that Lennox systems aren't designed for, which can cause repeat shutdowns or bypass a needed safety margin. The OEM Lennox \u003cstrong\u003e71W43\u003c\/strong\u003e guarantees the correct set point, terminal layout, and mounting bracket for a proper, safe fit the first time.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097036147,"sku":"LNX-71W43","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-71W43.jpg?v=1783762596","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-71w43","provider":"National HVAC Parts","version":"1.0","type":"link"}