OEM Lennox Integrated Furnace Control Board — 46M9901

The genuine OEM Lennox 46M9901 integrated furnace control board governs the complete heating cycle of your Lennox gas furnace. It sequences the inducer motor, hot-surface igniter, gas valve, and circulating blower while continuously monitoring safety limits and flame sense to keep operation safe and efficient. Built to Lennox factory tolerances, it drops directly into the platforms this board serves.

Common failure symptoms: A failing 46M9901 often shows up as no ignition, a furnace that lights then locks out, a blower that runs constantly or not at all, flashing diagnostic error codes, or erratic short-cycling. Visible relay damage, burnt connectors, or a board that has lost communication with the thermostat point to a control that should be replaced.

Why OEM matters: Generic replacement boards can carry mismatched firmware and relay ratings that disrupt Lennox ignition timing and trip protective lockouts. Choosing the factory-original 46M9901 ensures exact pin configuration, proper sequencing, and full compatibility with your Lennox furnace's safety and efficiency design — protecting both performance and equipment warranty.