{"product_id":"oem-lennox-pressure-switch-92l21","title":"OEM Lennox Pressure Switch — 92L21","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e92L21\u003c\/strong\u003e pressure switch is a critical safety control that confirms the draft inducer is producing proper venting airflow before the furnace is allowed to ignite. It monitors negative pressure in the vent system and closes to prove draft, protecting your Lennox equipment from unsafe combustion conditions.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e furnace that clicks but never lights, repeated ignition lockouts, a control board flashing a pressure-switch fault code, or short cycling. A stuck-open or stuck-closed switch, cracked diaphragm, or clogged sensing port are typical culprits.\u003c\/p\u003e\u003cp\u003eOEM matters here because the \u003cstrong\u003e92L21\u003c\/strong\u003e is calibrated to a specific trip pressure matched to your Lennox inducer and venting design. An incorrect switch can allow ignition without adequate draft or block heating entirely with false faults. This factory part restores accurate, safe pressure sensing and keeps your furnace's safety sequence intact.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081091662195,"sku":"LNX-92L21","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-92L21.jpg?v=1783763097","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-92l21","provider":"National HVAC Parts","version":"1.0","type":"link"}