{"product_id":"oem-lennox-pressure-switch-26w42","title":"OEM Lennox Pressure Switch — 26W42","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e26W42\u003c\/strong\u003e pressure switch is a draft-proving safety device for Lennox gas furnaces. It measures the vacuum produced by the inducer blower and closes its electrical contacts only when proper combustion airflow is confirmed. This signal allows the furnace control board to safely energize the igniter and gas valve, guarding against blocked flues and hazardous flue-gas spillage.\u003c\/p\u003e\u003cp\u003eSymptoms of a bad \u003cstrong\u003e26W42\u003c\/strong\u003e include a furnace that starts the inducer but never lights, ignition that begins then immediately shuts down, repeated pressure-switch lockout codes, or a complete loss of heat. Cracked or disconnected tubing, moisture in the pressure line, and fatigued internal contacts commonly prevent the switch from closing on a proven draft.\u003c\/p\u003e\u003cp\u003eOEM is the right choice because the \u003cstrong\u003e26W42\u003c\/strong\u003e is calibrated to the specific pressure set point your Lennox furnace was engineered around. An off-spec aftermarket switch can cause nuisance shutdowns or fail to detect a genuine venting fault. Installing the correct factory Lennox part ensures an exact fit, the proper trip pressure, and safe, trouble-free furnace operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081111126387,"sku":"LNX-26W42","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-26W42.jpg?v=1783763014","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-26w42","provider":"National HVAC Parts","version":"1.0","type":"link"}