{"product_id":"oem-lennox-pressure-switch-with-bracket-51w90","title":"OEM Lennox Pressure Switch with Bracket — 51W90","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e51W90\u003c\/strong\u003e pressure switch ships complete with its factory mounting bracket, ready for direct installation in your Lennox furnace or heat pump. This air-proving switch is a critical safety component that monitors draft and combustion airflow. It confirms the inducer motor is moving air correctly before allowing the ignition sequence to proceed, protecting your system and home from unsafe operating conditions.\u003c\/p\u003e\u003cp\u003eWhen a pressure switch begins to fail, you'll often see the furnace lock out on start-up, short-cycle, or throw a pressure-switch error code on the control board. A blocked vent, a weak inducer, or a switch that no longer closes at the rated pressure will all interrupt the ignition sequence and leave you without heat. Replacing the switch with a correctly calibrated OEM unit restores reliable, safe firing.\u003c\/p\u003e\u003cp\u003eChoosing OEM matters here because pressure switches are calibrated to a specific set point measured in inches of water column. A generic switch with the wrong trip pressure can nuisance-trip or, worse, allow unsafe operation. The Lennox \u003cstrong\u003e51W90\u003c\/strong\u003e is factory-matched to your equipment's exact specifications, ensuring proper safety response and full compatibility.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081145401715,"sku":"LNX-51W90","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-51W90.jpg?v=1783762972","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-with-bracket-51w90","provider":"National HVAC Parts","version":"1.0","type":"link"}