{"product_id":"oem-lennox-ignition-control-board-81w03","title":"OEM Lennox Ignition Control Board — 81W03","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e81W03\u003c\/strong\u003e ignition control board is the brain of your furnace's startup sequence. It manages the timed ignition process — energizing the igniter, opening the gas valve, verifying flame through the sensor, and controlling the inducer and blower — while enforcing critical safety lockouts. Built to Lennox factory specifications, it drops directly into the equipment it was designed for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace will not light or ignition attempts fail, repeated lockouts after a set number of tries, the igniter or inducer not energizing, erratic or short cycling, error codes flashing on the diagnostic LED, or a complete no-heat condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox ignition timing, flame-sense thresholds, and safety logic are programmed specifically for your model. A mismatched aftermarket board can misread flame, mis-time the ignition sequence, or bypass protections, risking nuisance faults or unsafe operation. The OEM \u003cstrong\u003e81W03\u003c\/strong\u003e guarantees correct firmware, connector layout, and proven reliability for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081094185331,"sku":"LNX-81W03","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-81W03.jpg?v=1783762102","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-ignition-control-board-81w03","provider":"National HVAC Parts","version":"1.0","type":"link"}