OEM Lennox Gas Valve — 605901

The genuine OEM Lennox 605901 gas valve controls and regulates the flow of natural gas or propane to your furnace burners, opening on a call for heat and shutting off instantly when the cycle ends or a safety fault occurs. As one of the most critical safety components in your Lennox heating system, it maintains precise manifold pressure so the burners light cleanly and fire at the correct input rate.

Common symptoms of a failing 605901 gas valve include a furnace that ignites the igniter but never lights the burners, no heat despite a working thermostat, delayed ignition or rollout, a buzzing or chattering solenoid, or a burner that won't stay lit. A stuck or non-responsive valve will typically leave the system locked out with no gas delivery.

OEM matters here more than almost anywhere in the furnace. Lennox calibrates the 605901 to specific pressure, voltage, and staging parameters matched to their burner design and control board logic. Installing an incorrect or aftermarket valve risks improper combustion, unsafe operation, and voided warranties. This factory-authorized replacement ensures safe, reliable ignition and correct gas regulation for your Lennox equipment.