{"product_id":"oem-lennox-pressure-switch-w-bracket-80k28","title":"OEM Lennox Pressure Switch w\/ Bracket — 80K28","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e80K28\u003c\/strong\u003e pressure switch ships complete with its mounting bracket for a fast, correct installation. This safety control verifies proper venting and combustion airflow by sensing the negative pressure produced by the inducer motor, and it must prove a clear flue before your furnace will allow the burners to ignite.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e When the \u003cstrong\u003e80K28\u003c\/strong\u003e fails, the furnace typically short-cycles, locks out during the ignition sequence, or displays a pressure switch fault. A stuck-open switch prevents any heating, while a stuck-closed switch can bypass a vital safety check — either condition calls for immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The switch's calibrated trip point, measured in inches of water column, is matched to your specific Lennox furnace. The genuine \u003cstrong\u003e80K28\u003c\/strong\u003e — with the factory bracket already fitted — guarantees correct pressure rating, port configuration, mounting alignment, and electrical connections. Aftermarket alternatives with incorrect setpoints or improvised mounting can cause nuisance lockouts, airflow-sensing errors, or unsafe operation, and may void your equipment warranty.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081094775155,"sku":"LNX-80K28","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-80K28.jpg?v=1783762952","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-w-bracket-80k28","provider":"National HVAC Parts","version":"1.0","type":"link"}