OEM Lennox Ignition Control Board — 73W45
OEM Guaranteed
Same-Day Ship
30-Day Returns
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The genuine OEM Lennox 73W45 Ignition Control Board is the brain of your furnace's heating sequence. It manages the ignition process, sequences the draft inducer, igniter, gas valve, and blower, and continuously monitors the flame sensor and safety switches to ensure safe, reliable operation. This board is programmed and pinned specifically for compatible Lennox furnace models.
Common failure symptoms: A failing ignition control board often shows up as no ignition, short cycling, the furnace failing to start on a call for heat, blower running continuously, or diagnostic LED fault codes. Cracked solder joints, burnt relays, corroded connectors, and surge or heat damage are the usual causes of board failure.
Why OEM matters: The OEM Lennox 73W45 board carries the exact firmware, timing, and safety logic your furnace was certified with. Universal or aftermarket boards may not sequence components correctly or honor every safety interlock, risking nuisance lockouts or unsafe operation. Installing the factory board restores precise, code-compliant ignition control and preserves your equipment warranty.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days