{"product_id":"oem-lennox-pressure-switch-12w48","title":"OEM Lennox Pressure Switch — 12W48","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12W48\u003c\/strong\u003e pressure switch is a factory safety device that verifies proper draft before your furnace begins its ignition sequence. As the draft inducer motor spins up, it creates negative pressure that closes this switch, signaling the control board that the venting system is clear and combustion can proceed safely. Without a correctly functioning switch, the furnace will not fire.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e12W48\u003c\/strong\u003e pressure switch fails, the furnace typically locks out on ignition, short-cycles, or displays a pressure-switch fault code. Symptoms can also point to related issues such as a blocked flue, condensate drain, or inducer problems, so verify airflow before replacing. A stuck-open or stuck-closed diaphragm is the usual cause of failure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Each Lennox pressure switch is calibrated to a model-specific trip point. Substituting a generic switch risks nuisance lockouts or unsafe operation if the set point differs. The OEM \u003cstrong\u003e12W48\u003c\/strong\u003e guarantees the exact calibration, hose fitting, and electrical connector your Lennox furnace requires for safe, dependable heating.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081115550067,"sku":"LNX-12W48","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-LNX-12W48.jpg?v=1783762985","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-12w48","provider":"National HVAC Parts","version":"1.0","type":"link"}