{"product_id":"oem-lennox-dual-pressure-switch-29w64","title":"OEM Lennox Dual Pressure Switch — 29W64","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e29W64\u003c\/strong\u003e dual pressure switch is a safety control that confirms proper venting and combustion airflow before your furnace lights. It monitors the negative pressure created by the inducer motor across two stages, proving the flue is clear and allowing the ignition sequence to proceed only when it is safe to do so in compatible Lennox furnaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failed \u003cstrong\u003e29W64\u003c\/strong\u003e commonly causes the furnace to lock out or refuse to ignite, the inducer motor to run without the burners firing, pressure-switch or venting error codes, and repeated failed ignition attempts. Stuck-open or stuck-closed contacts, cracked diaphragms, and blocked pressure ports are typical causes of failure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Pressure switches are calibrated to specific actuation set points measured in inches of water column. The authentic OEM \u003cstrong\u003e29W64\u003c\/strong\u003e is factory-set to the exact Lennox specifications for both stages, ensuring accurate draft verification and full safety compliance. Aftermarket switches with incorrect trip pressures can cause nuisance lockouts or bypass essential venting checks. Choose the genuine Lennox part for safe, reliable ignition.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081109553523,"sku":"LNX-29W64","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-29W64.jpg?v=1783760320","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-dual-pressure-switch-29w64","provider":"National HVAC Parts","version":"1.0","type":"link"}