{"product_id":"oem-lennox-pressure-switch-79j08","title":"OEM Lennox Pressure Switch — 79J08","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e79J08\u003c\/strong\u003e pressure switch is a critical safety control that confirms proper draft and venting before your furnace's ignition sequence begins. It senses negative pressure created by the inducer motor and, only when correct airflow is proven, closes its contacts to allow the burners to fire — protecting your home from unsafe combustion and flue gas spillage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSymptoms of a failing pressure switch include:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFurnace ignites then shuts down (short-cycling)\u003c\/li\u003e\n\u003cli\u003eInducer runs but burners never light\u003c\/li\u003e\n\u003cli\u003eBlinking fault codes indicating a pressure switch fault\u003c\/li\u003e\n\u003cli\u003eNo heat despite a call for heat from the thermostat\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eBecause the \u003cstrong\u003e79J08\u003c\/strong\u003e is a safety-critical component, using the exact OEM Lennox part is essential — the pressure setpoint is calibrated precisely to your furnace's inducer and venting design. An incorrect or generic switch can trip nuisance faults or, worse, fail to detect a genuine venting problem. Install the factory-matched \u003cstrong\u003e79J08\u003c\/strong\u003e to restore reliable, safe operation to your Lennox furnace.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081095168371,"sku":"LNX-79J08","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-79J08.jpg?v=1783763078","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-79j08","provider":"National HVAC Parts","version":"1.0","type":"link"}