{"product_id":"oem-lennox-limit-switch-73w18","title":"OEM Lennox Limit Switch — 73W18","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e73W18\u003c\/strong\u003e limit switch is a factory-calibrated safety control that guards your furnace against dangerous overheating. Positioned to sense heat exchanger and plenum temperatures, it opens the burner circuit the moment temperatures climb past a safe limit — most often triggered by reduced airflow. Each switch is set to the exact trip and auto-reset points specified for your Lennox equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include the furnace repeatedly shutting off before reaching setpoint, short cycling, delivering lukewarm air, or a complete no-heat condition. A worn or nuisance-tripping limit switch is one of the most common causes of intermittent heating problems, particularly alongside clogged filters or restricted returns.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e generic replacements frequently carry incorrect temperature ratings and mounting profiles that undermine the protective role of this component. Choosing the factory \u003cstrong\u003e73W18\u003c\/strong\u003e guarantees the right calibration, secure fit, and dependable safety performance for your Lennox furnace, while helping preserve your equipment warranty.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081096118643,"sku":"LNX-73W18","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-73W18.jpg?v=1783762599","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-73w18","provider":"National HVAC Parts","version":"1.0","type":"link"}