OEM Lennox Control Board Kit — 11H36
OEM Guaranteed
Same-Day Ship
30-Day Returns
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The genuine OEM Lennox 11H36 control board kit is the electronic brain of your Lennox furnace or air handler, coordinating ignition sequencing, blower and inducer timing, and critical safety limit monitoring. It reads inputs from the thermostat, flame sensor, and pressure switches, then energizes the gas valve, igniter, and motors in the correct order every heating cycle. This kit is a complete factory replacement built to Lennox specifications.
Common failure symptoms: a failing control board may cause a furnace that won't ignite, a blower that runs constantly or not at all, intermittent no-heat calls, error or fault codes flashing on the board's diagnostic LED, or a system that short-cycles. Burnt spots, corroded relays, or a cracked board are clear signs of failure.
Why OEM matters: the Lennox 11H36 is programmed with the exact firmware, relay ratings, and connector layout your Lennox model requires. Genuine OEM boards drop in without rewiring or jumper adjustments, maintain proper safety sequencing, and protect your warranty — reliability that generic aftermarket boards cannot guarantee.
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