{"product_id":"oem-lennox-limit-switch-80k89","title":"OEM Lennox Limit Switch — 80K89","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80K89\u003c\/strong\u003e limit switch is a temperature-sensing safety control that protects your furnace from overheating. Mounted on the heat exchanger or plenum, it monitors supply-air temperature and opens the circuit to shut down the burners if the furnace gets too hot — typically caused by restricted airflow. It also helps coordinate blower operation, and it is a direct-fit replacement built to your Lennox furnace's exact trip temperature.\u003c\/p\u003e\u003cp\u003eSymptoms of a bad limit switch include a furnace that short cycles on and off, burners that shut down while the blower keeps running, no heat with a tripped or open switch, or nuisance lockouts even when airflow seems normal. A dirty filter, blocked vents, or a weak blower can also cause the switch to trip legitimately, so airflow should be verified during replacement.\u003c\/p\u003e\u003cp\u003eInstalling the OEM Lennox \u003cstrong\u003e80K89\u003c\/strong\u003e ensures the correct open and close temperature setpoints your furnace was engineered around. A universal switch with the wrong trip rating can allow dangerous overheating or cause constant nuisance shutdowns. As a safety-critical component, only a genuine OEM limit switch should be used — an inexpensive part that safeguards your furnace and your warranty.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081094578547,"sku":"LNX-80K89","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-80K89.jpg?v=1783762616","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-80k89","provider":"National HVAC Parts","version":"1.0","type":"link"}