OEM Lennox Gas Valve — 74W26

The genuine OEM Lennox 74W26 gas valve regulates the flow of natural or LP gas to your furnace burners, opening and closing on command from the ignition control board. It maintains the correct manifold pressure for clean, efficient combustion and includes the safety solenoids that shut off fuel the instant a fault is detected. This valve is calibrated to the exact specifications your Lennox furnace requires.

A failing gas valve typically shows up as a furnace that ignites weakly or not at all, burners that won't stay lit, delayed ignition with a noticeable "whoomph," or a complete no-heat condition despite a working igniter. Stuck solenoids, worn regulator diaphragms, and internal electrical failures are the usual failure modes and are a common cause of no-heat service calls.

Because a gas valve controls fuel delivery, using the OEM 74W26 is critical for safe operation. Factory calibration guarantees the correct manifold pressure and reliable safety shutoff, while mismatched valves risk improper firing, sooting, or hazardous gas leaks. Installing the OEM part protects your equipment, your warranty, and your home.