{"product_id":"oem-lennox-limit-switch-56w25","title":"OEM Lennox Limit Switch — 56W25","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e56W25\u003c\/strong\u003e limit switch is a temperature-sensing safety control for your Lennox gas furnace. Mounted near the heat exchanger, it continuously monitors plenum temperature and interrupts power to the burners whenever heat rises above the safe operating limit — typically caused by restricted airflow, a dirty filter, or blower failure. The \u003cstrong\u003e56W25\u003c\/strong\u003e is factory-set to the specific trip temperature your Lennox model was designed around.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A degraded \u003cstrong\u003e56W25\u003c\/strong\u003e commonly produces short cycling, where the furnace fires and then shuts down after a short run, or nuisance high-limit lockouts even when airflow is normal. You may also see the blower running non-stop, intermittent no-heat episodes, or the furnace failing to complete a full heat cycle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e As a safety-critical component, the limit switch must open at exactly the right temperature. Generic replacements with incorrect trip points can either shut the system down needlessly or fail to protect the heat exchanger from dangerous overheating. The OEM \u003cstrong\u003e56W25\u003c\/strong\u003e delivers the precise calibration, ratings, and fit Lennox intended, safeguarding both performance and safety.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081102213491,"sku":"LNX-56W25","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-56W25.jpg?v=1783762580","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-56w25","provider":"National HVAC Parts","version":"1.0","type":"link"}