{"product_id":"oem-lennox-limit-switch-69w36","title":"OEM Lennox Limit Switch — 69W36","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e69W36\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your furnace's heat exchanger and plenum. When the air temperature climbs above the factory-set threshold, this switch interrupts the burner circuit to prevent overheating, protecting your heat exchanger and the surrounding equipment from thermal damage. It is engineered to the exact trip point and mounting specification your Lennox furnace requires.\u003c\/p\u003e\u003cp\u003eA failing \u003cstrong\u003e69W36\u003c\/strong\u003e limit switch often shows up as short cycling, where the furnace repeatedly shuts off before reaching the set temperature, or as a system that produces no heat at all because the switch has tripped open permanently. Nuisance lockouts, a blower that runs continuously, or intermittent no-heat calls are all common symptoms of a worn or drifting limit switch.\u003c\/p\u003e\u003cp\u003eBecause this is a safety-critical component, using a genuine OEM Lennox part matters. Aftermarket switches may trip at incorrect temperatures, leaving your system either unprotected or prone to false shutdowns. The factory \u003cstrong\u003e69W36\u003c\/strong\u003e guarantees the correct calibration, terminal layout, and fit for reliable, safe furnace operation season after season.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097789811,"sku":"LNX-69W36","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-69W36.jpg?v=1783762591","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-69w36","provider":"National HVAC Parts","version":"1.0","type":"link"}