{"product_id":"oem-lennox-integrated-furnace-control-board-12j99","title":"OEM Lennox Integrated Furnace Control Board — 12J99","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e12J99\u003c\/strong\u003e is a genuine OEM integrated furnace control board (IFC) that serves as the brain of your Lennox gas furnace. It coordinates the entire heating sequence — monitoring the thermostat call, sequencing the draft inducer, igniter, gas valve, and blower, and running continuous flame-sense and safety-limit checks. This board is a direct factory replacement engineered to match the exact firmware, relays, and connector pinout of your Lennox system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e furnace that won't ignite or has no response to a heat call, blower running constantly, intermittent lockouts, error\/fault codes flashing on the diagnostic LED, cracked solder joints, or scorched relay contacts. Electrical surges, moisture, and repeated hard cycling are typical causes of board failure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e A factory Lennox \u003cstrong\u003e12J99\u003c\/strong\u003e board guarantees correct ignition timing, blower speed logic, and safety interlocks that aftermarket boards often can't replicate. Using an OEM control board protects your furnace's warranty and ensures reliable, safe operation season after season.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081145631091,"sku":"LNX-12J99","price":129.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-LNX-12J99.jpg?v=1783762229","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-integrated-furnace-control-board-12j99","provider":"National HVAC Parts","version":"1.0","type":"link"}