{"product_id":"oem-lennox-pressure-switch-14a45","title":"OEM Lennox Pressure Switch — 14A45","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e14A45\u003c\/strong\u003e pressure switch is a safety control that confirms proper combustion airflow and venting before your Lennox furnace is allowed to ignite. It senses the negative pressure created by the draft inducer motor and closes only when adequate airflow is verified — ensuring flue gases are being safely vented and preventing ignition under blocked-vent conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace failing to ignite, the inducer running but no burner light-off, repeated lockouts, or an error code indicating an open pressure switch. Failures are often caused by a cracked pressure hose, blocked vent or condensate drain, a weak inducer, or a switch whose diaphragm has fatigued and no longer actuates at the correct setpoint.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e the Lennox \u003cstrong\u003e14A45\u003c\/strong\u003e is factory-set to the precise pressure threshold your furnace model requires. A switch with the wrong setpoint can allow unsafe operation or cause persistent nuisance lockouts. Installing the factory-specified part ensures accurate draft proving, dependable safety response, and full compatibility with your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081140420979,"sku":"LNX-14A45","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-draft-inducer-LNX-14A45.jpg?v=1783762992","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-14a45","provider":"National HVAC Parts","version":"1.0","type":"link"}