{"product_id":"oem-lennox-limit-switch-69h13","title":"OEM Lennox Limit Switch — 69H13","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e69H13\u003c\/strong\u003e limit switch is a critical safety control that monitors the temperature inside your Lennox furnace's heat exchanger compartment. If temperatures climb too high — typically due to restricted airflow — the switch opens to shut off the burners, preventing overheating, heat exchanger damage, and potential safety hazards. It is a first line of defense in your furnace's safety circuit.\u003c\/p\u003e\u003cp\u003eA failing or tripping limit switch often shows up as a furnace that short-cycles, burners that ignite and then quickly shut off, the blower running continuously, or a complete no-heat condition. While a bad switch can be the fault, a repeatedly tripping limit is frequently caused by a dirty filter, blocked ducts, or a weak blower — so airflow should always be checked alongside replacement.\u003c\/p\u003e\u003cp\u003eOEM matters because the \u003cstrong\u003e69H13\u003c\/strong\u003e is calibrated to the precise temperature trip point and reset rating your Lennox furnace was designed to use. An aftermarket switch with a different setpoint may nuisance-trip or, worse, fail to open when it should. Installing the correct factory-spec limit switch restores proper overheat protection and keeps your Lennox system operating safely and reliably.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081098084723,"sku":"LNX-69H13","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-69H13.jpg?v=1783762588","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-69h13","provider":"National HVAC Parts","version":"1.0","type":"link"}