OEM Lennox Integrated Furnace Control Board Kit — 86W81

The genuine OEM Lennox 86W81 integrated furnace control board kit is the electronic brain of your Lennox furnace. It manages the entire heating sequence — igniter warm-up, gas valve timing, inducer and blower operation, and the safety interlocks that monitor limit and pressure switches. Supplied as a complete kit with the hardware and instructions needed for a clean swap, it restores full control functionality to your system.

Common failure symptoms: A failing control board can cause no ignition, a furnace that won't respond to the thermostat, flashing diagnostic LED fault codes, an inducer or blower that runs erratically, or intermittent lockouts. Because the board ties every component together, its failure often mimics several other problems at once.

Why OEM matters: The furnace control board is tightly matched to your model's ignition timing, safety logic, and connector layout. A generic board can misfire the sequence, throw false fault codes, or fail to communicate with staged and variable-speed components. The OEM Lennox 86W81 kit is programmed to factory specification with the exact firmware and pinout your furnace expects — the safe, reliable choice that protects your equipment and warranty.