OEM Lennox ECM Control Board 17B0034N02 — Y5971
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The Lennox Y5971 is an ECM (electronically commutated motor) control board, factory reference 17B0034N02, that drives and manages a variable-speed blower or motor in compatible Lennox air handlers and furnaces. The board translates system demand signals into precise motor speed and torque commands, enabling the quiet, energy-efficient, staged airflow that variable-speed Lennox systems are known for.
Common failure symptoms: A failing Y5971 may cause the blower to run at the wrong speed, surge, or refuse to start, along with no airflow, intermittent operation, error or fault codes at the control, or a motor that hums but won't spin. Power surges, moisture, and normal aging are frequent causes of ECM board failure.
Why OEM matters: ECM control boards are programmed to the exact motor and system they ship with. A genuine OEM Y5971 ensures the correct firmware, speed tables, and connector pinout so the blower delivers rated airflow and efficiency. Generic replacements risk mismatched programming, poor comfort performance, and repeat failures — using the OEM board protects both the motor and your Lennox 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