{"product_id":"oem-lennox-dual-pressure-switch-assembly-63w57","title":"OEM Lennox Dual Pressure Switch Assembly — 63W57","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e63W57\u003c\/strong\u003e dual pressure switch assembly is a key safety control in your Lennox gas furnace. Using two calibrated diaphragm switches, it monitors the negative pressure created by the inducer blower to confirm proper venting and adequate combustion airflow before allowing the burners to ignite. If safe draft isn't verified, the switch prevents ignition to protect your home.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e furnace that ignites then shuts down, repeated lockouts, blank or error codes on the control board, no ignition despite a running inducer, or short cycling. Blocked hoses, a stuck diaphragm, or a drifting setpoint can all cause a bad switch to falsely open or close.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e the \u003cstrong\u003e63W57\u003c\/strong\u003e is factory-calibrated to the exact pressure thresholds your Lennox furnace expects. Aftermarket switches with incorrect setpoints cause nuisance trips or, worse, fail to detect a genuine venting problem. Installing the authentic Lennox part guarantees accurate pressure sensing, reliable ignition sequencing, and the safety protection your furnace was engineered to provide.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081099100531,"sku":"LNX-63W57","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-dual-LNX-63W57.jpg?v=1783760315","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-dual-pressure-switch-assembly-63w57","provider":"National HVAC Parts","version":"1.0","type":"link"}