{"product_id":"oem-lennox-pressure-switch-12w53","title":"OEM Lennox Pressure Switch — 12W53","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e12W53\u003c\/strong\u003e pressure switch is a critical safety device that confirms your furnace's draft inducer is producing adequate venting before the burners are allowed to light. On compatible Lennox furnaces it senses negative pressure in the vent system and closes its contacts to signal the control board that combustion airflow is safe and unobstructed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e The furnace ignites briefly then shuts down, it locks out on a pressure switch fault code, the unit fails to start in cold or windy conditions, or you experience repeated short-cycling. A cracked diaphragm, a stuck-open or stuck-closed switch, or a clogged sensing hose are common causes.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The Lennox \u003cstrong\u003e12W53\u003c\/strong\u003e is calibrated to the precise pressure setpoint your furnace requires to prove draft safely. A mismatched switch can allow ignition under unsafe venting conditions or nuisance-trip a healthy system. The factory OEM part ensures accurate, reliable safety sensing and preserves your warranty.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081115484531,"sku":"LNX-12W53","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-12W53.jpg?v=1783762987","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-12w53","provider":"National HVAC Parts","version":"1.0","type":"link"}