{"product_id":"oem-lennox-elite-single-stage-ignition-control-74w03","title":"OEM Lennox Elite Single-Stage Ignition Control — 74W03","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e74W03\u003c\/strong\u003e (factory part number 103098-01) is a genuine OEM single-stage ignition control designed for Lennox Elite series furnaces. This integrated control manages the ignition sequence for single-stage heating — coordinating the inducer motor, hot surface or spark igniter, gas valve, flame sensing, and blower timing to deliver safe, reliable warmth on every call for heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include no ignition, repeated ignition lockout, short cycling, a furnace that will not respond to the thermostat, error or fault codes on the control's diagnostic LED, or the blower and inducer running erratically. Because this board handles flame verification, a failing 74W03 will often shut the system down as a safety precaution, leaving you without heat.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e The \u003cstrong\u003e74W03\u003c\/strong\u003e is built to the precise timing, flame-sense sensitivity, and voltage tolerances your Lennox Elite furnace requires. Aftermarket substitutes may not match the factory ignition profile, leading to nuisance lockouts, unsafe flame conditions, or premature failure. Choosing the OEM control ensures correct sequencing, protects your warranty, and keeps your Lennox Elite system operating exactly as engineered.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081079505267,"sku":"LNX-74W03","price":39.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-control-board-furnace-LNX-74W03.jpg?v=1783760687","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-elite-single-stage-ignition-control-74w03","provider":"National HVAC Parts","version":"1.0","type":"link"}