OEM Lennox Integrated Control Board — 12L4201
OEM Guaranteed
Same-Day Ship
30-Day Returns
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The genuine OEM Lennox 12L4201 control board is the electronic control module at the heart of your Lennox furnace. It orchestrates the heating cycle from start to finish — powering the hot surface igniter, opening the gas valve, verifying flame with the sensor, and staging the inducer and circulating blower for safe, efficient performance in compatible Lennox models.
Common failure symptoms: A failing 12L4201 board often causes a furnace that won't light, ignition lockouts after a few seconds, rapid short-cycling, a blower stuck on or off, or an unresponsive thermostat. Moisture intrusion, power surges, and failed relays are frequent causes, usually indicated by a flashing fault code.
Why OEM matters: Aftermarket boards can misread Lennox flame-sensing signals and disrupt critical safety timing. The OEM 12L4201 guarantees a precise electrical and firmware match for your Lennox furnace, ensuring safe, reliable operation and protecting your 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