{"product_id":"oem-lennox-limit-switch-56w20","title":"OEM Lennox Limit Switch — 56W20","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e56W20\u003c\/strong\u003e limit switch is a critical high-temperature safety control found in Lennox gas and electric furnaces. It continuously monitors the temperature inside the heat exchanger and plenum, opening the circuit to shut off the burners if the unit overheats. This protects the heat exchanger from cracking and prevents dangerous conditions caused by restricted airflow, a failed blower motor, or a clogged filter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e56W20\u003c\/strong\u003e fails or trips repeatedly, you may notice the furnace short-cycling, the burners igniting and quickly shutting off, no heat output, or the blower running continuously. A limit switch that has weakened over time can nuisance-trip even when temperatures are normal, leaving your home cold.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox engineers this limit switch to a precise trip temperature and reset threshold specific to your furnace model. Aftermarket substitutes with incorrect settings can either fail to protect the heat exchanger or cause constant nuisance trips. Installing the factory-spec \u003cstrong\u003e56W20\u003c\/strong\u003e ensures accurate, reliable safety operation and preserves your Lennox equipment warranty and rated performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081102311795,"sku":"LNX-56W20","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-56W20.jpg?v=1783762575","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-56w20","provider":"National HVAC Parts","version":"1.0","type":"link"}