OEM Lennox Fan Blower Control Board — 81L75
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The genuine OEM Lennox 81L75 fan blower control board manages when and how your furnace's indoor blower runs. It handles heat and cool blower timing (on/off delays), fan-speed selection, and the interface between the thermostat call and the blower motor, ensuring smooth, comfortable airflow and preventing cold or hot air drafts at startup and shutdown. It is built to Lennox factory specifications for a direct fit.
Common failure symptoms: the blower runs constantly or won't start, incorrect on/off delays, the fan failing to switch between heat and cool speeds, intermittent operation, no airflow despite a thermostat call, or burnt spots and relay chatter on the board itself.
Why OEM matters: Lennox blower timing profiles and relay ratings are tuned to your specific motor and system. An aftermarket board can mis-time the fan, drive the wrong speed, or overload relays, causing comfort issues and premature failure. The OEM 81L75 ensures correct timing logic, connector compatibility, and dependable performance in 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