{"product_id":"oem-lennox-furnace-limit-switch-73k17","title":"OEM Lennox Furnace Limit Switch — 73K17","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e73K17\u003c\/strong\u003e is a high-limit safety switch that monitors heat exchanger temperature to keep your Lennox furnace running safely. When temperatures exceed the switch's rated setpoint, the \u003cstrong\u003e73K17\u003c\/strong\u003e opens the control circuit to the burners or gas valve, stopping the heating cycle and preventing damage from overheating; it resets automatically as the system cools. This dependable safety component is used across a broad range of Lennox gas furnaces and air handlers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A malfunctioning limit switch often shows up as short cycling, no heat, a blower that will not turn off, or a limit-circuit fault reported by the furnace control board. Repeated heating cycles can wear the bimetal sensing element, leading to early tripping or a failure to trip when needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Each \u003cstrong\u003e73K17\u003c\/strong\u003e is factory-calibrated to a specific trip and reset temperature for your Lennox equipment. An off-spec generic part can cause unsafe operation or false shutdowns. The OEM \u003cstrong\u003e73K17\u003c\/strong\u003e provides the exact temperature calibration, correct terminals, and proper mounting for reliable, safe furnace performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081096413555,"sku":"LNX-73K17","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-73K17.jpg?v=1783761152","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-furnace-limit-switch-73k17","provider":"National HVAC Parts","version":"1.0","type":"link"}