{"product_id":"oem-lennox-pulse-furnace-ignition-control-board-y4749","title":"OEM Lennox Pulse Furnace Ignition Control Board — Y4749","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003eY4749\u003c\/strong\u003e pulse furnace ignition control board is the brain of your Lennox Pulse furnace's ignition sequence. It manages the timing of purge, spark ignition, flame verification, and gas valve operation to ensure your furnace lights safely and reliably on every call for heat. This board is engineered specifically for Lennox Pulse combustion systems and their unique sealed-combustion firing cycle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include a furnace that will not ignite, repeated lockouts, no response to the thermostat, an ignition sequence that starts but never lights, or the blower running without heat. Intermittent no-heat calls — especially on cold mornings — often trace back to a failing ignition control board or its onboard relays.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e the Lennox Pulse furnace uses a proprietary pulse-combustion design with tightly controlled ignition timing and safety logic. Aftermarket or universal boards may not replicate the exact firing sequence, flame-sense thresholds, or safety interlocks, risking nuisance lockouts or unsafe operation. Installing the factory \u003cstrong\u003eY4749\u003c\/strong\u003e guarantees correct fit, verified safety functions, and rated performance for your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081089794419,"sku":"LNX-Y4749","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-Y4749.jpg?v=1783763139","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pulse-furnace-ignition-control-board-y4749","provider":"National HVAC Parts","version":"1.0","type":"link"}