OEM Lennox Gas Valve — 50W74

The genuine OEM Lennox 50W74 gas valve regulates the flow of natural or LP gas to the burners in your Lennox furnace, opening and closing on command from the control board and igniter sequence. It delivers the correct manifold pressure for clean, efficient combustion and includes the built-in safety shutoff that prevents gas flow when a call for heat is absent.

Common failure symptoms: A faulty gas valve often shows up as a furnace that ignites the igniter but never lights the burners, no heat despite a running blower, delayed ignition with a rollout "whoomph," a clicking valve that won't open, or intermittent heating. Because the valve is a safety-critical component, any hesitation in gas delivery should be addressed promptly.

Why OEM matters: The Lennox 50W74 is calibrated to the exact manifold pressure, voltage, and connection spec your furnace requires, and it carries the safety certifications matched to your model. Substituting a generic valve risks incorrect gas pressure, improper combustion, and compromised safety interlocks. Choosing the factory OEM part ensures a proper fit, reliable ignition, and full compliance with your Lennox equipment. In stock and ships same day before 3PM CST.