OEM Lennox Integrated Furnace Control Board — X4459
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30-Day Returns
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The genuine OEM Lennox X4459 integrated furnace control board governs every stage of your Lennox furnace's operation. It sequences the hot surface igniter, opens the gas valve, verifies flame with the sensor circuit, and stages the inducer and blower motors for safe, efficient heat. This board is engineered to the exact electrical and firmware specifications of compatible Lennox furnace platforms.
Common failure symptoms: Watch for a furnace that fails to start, ignites then locks out, cycles on and off rapidly, or blows cold air. A dead control board may also leave the blower running nonstop or produce no response at the thermostat. Diagnostic LED fault codes on the board typically point to the source.
Why OEM matters: Generic replacements frequently mis-handle Lennox flame-sensing and timing routines, causing nuisance lockouts or unsafe operation. The OEM X4459 delivers factory-matched connectors, relays, and control logic for guaranteed compatibility, safe performance, and preserved warranty coverage on 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