OEM Lennox Integrated Furnace Control Board — 85W79

The genuine OEM Lennox 85W79 integrated furnace control board is the electronic brain of your Lennox furnace. It manages the entire heating sequence — monitoring the thermostat call, energizing the draft inducer, verifying the pressure switch, timing the igniter warm-up, opening the gas valve, and staging the blower — while continuously watching flame sense and limit safety circuits to shut the system down if a fault is detected.

Common failure symptoms: No response to a heat call, no igniter glow, the furnace failing to sequence past the inducer, flashing diagnostic LED fault codes, intermittent lockouts, or a blower that runs constantly. Power surges, lightning, moisture, and failed relays or cracked solder joints are frequent causes of board failure.

Why OEM matters: The 85W79 is programmed with the exact ignition timing, safety logic, and blower profiles engineered for your Lennox furnace model. An OEM board ensures every stage of the sequence runs to factory specification and that safety lockouts behave correctly. Aftermarket or mismatched boards can misfire timing, disable protections, or throw false codes. Restore safe, reliable heating with the genuine Lennox control board.