OEM Lennox Control Board — 86G16

The genuine OEM Lennox 86G16 control board is the electronic brain of your Lennox furnace, coordinating the entire heating sequence — from calling the draft inducer and monitoring the pressure switches, to sequencing ignition, opening the gas valve, and timing blower on/off delays. It continuously reads safety inputs and thermostat demand to deliver correct, efficient, and protected operation.

When a control board fails, symptoms range widely: no response to a thermostat call, blower or inducer that won't start or won't shut off, intermittent ignition, error codes flashed by the diagnostic LED, or a furnace that resets randomly. Burnt relays, scorched traces, blown fuses, or failed sensing circuits on the board are common indicators that replacement is needed.

An OEM Lennox 86G16 ships with the exact firmware, relay ratings, timing parameters, and connector layout your furnace was designed around. Universal or aftermarket boards may lack model-specific logic and diagnostics, leading to improper sequencing, reduced efficiency, or voided warranty coverage. Install the factory-matched board to restore full, reliable control of your Lennox system.