OEM Lennox Ignition Control Board — 81W03
OEM Guaranteed
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30-Day Returns
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The genuine OEM Lennox 81W03 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.
Common failure symptoms: 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.
Why OEM matters: 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 81W03 guarantees correct firmware, connector layout, and proven reliability for your Lennox equipment.
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