{"product_id":"oem-lennox-limit-switch-69w42","title":"OEM Lennox Limit Switch — 69W42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e69W42\u003c\/strong\u003e limit switch is a temperature-sensing safety control that monitors the heat in your Lennox furnace's heat exchanger and plenum. If temperatures climb beyond safe limits — typically from restricted airflow — the switch opens to shut down the burners, protecting the heat exchanger and preventing a dangerous overheat condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A faulty \u003cstrong\u003e69W42\u003c\/strong\u003e can cause the furnace to short cycle on the limit, shut down unexpectedly during a heat call, fail to fire at all, or run the blower continuously. A switch that stays open blocks heating entirely, while one that fails closed removes vital overheat protection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Limit switches are calibrated to open and close at precise temperature setpoints matched to your specific furnace model. The factory-original Lennox \u003cstrong\u003e69W42\u003c\/strong\u003e guarantees the correct trip point, response, and mechanical fit — critical for a safety component. Generic switches with the wrong rating can nuisance-trip or, worse, fail to protect your equipment. OEM ensures your furnace shuts down exactly when it should.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081097527667,"sku":"LNX-69W42","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-69W42.jpg?v=1783762593","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-limit-switch-69w42","provider":"National HVAC Parts","version":"1.0","type":"link"}