OEM Lennox Outdoor Fan Power Circuit Board — 12U84
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The genuine OEM Lennox 12U84, also identified as part 104351-01, is an outdoor fan power circuit board that drives and regulates the condenser fan motor in your Lennox outdoor unit. It manages the power and control signals that start, run, and modulate the fan, ensuring proper airflow across the outdoor coil for efficient heat rejection during both cooling and heat-pump operation.
Common failure symptoms: When this circuit fails you may see an outdoor fan that won't start, runs at the wrong speed, cycles on and off erratically, or stops entirely — often accompanied by high head pressure, compressor overheating, reduced cooling capacity, or a system that trips on a high-pressure or fault lockout. Visible burnt spots, swollen capacitors, or a scorched smell on the board confirm the module needs replacement.
Why OEM matters: The Lennox 12U84 is matched to the exact voltage, motor type, and control protocol of your unit. Aftermarket boards frequently mismatch fan-speed programming or connector pinouts, leading to nuisance faults and premature failure. The authentic factory part guarantees plug-in compatibility, correct fan performance, and the long service life Lennox engineered. Get your outdoor unit moving air correctly again with the genuine replacement.
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