OEM Lennox Gas Valve — 31L82

The genuine OEM Lennox 31L82 gas valve controls the flow of natural or LP gas to the burners in your Lennox furnace. Working in concert with the ignition control and safety circuit, it opens on a call for heat and closes instantly when heating ends or a fault is detected — making it one of the most safety-critical components in the entire heating system.

Common failure symptoms: A failing gas valve often shows up as no heat, a furnace that clicks or attempts ignition but never lights, burners that fail to stay lit, delayed or short-cycling ignition, or a gas smell around the unit. A stuck or leaking valve can also trip the safety lockout, leaving the blower running with cold air.

Why OEM matters: Gas valves are calibrated for a specific pressure range and wired to match your furnace's control board and safety interlocks. An off-spec substitute risks improper gas metering, ignition faults, or unsafe operation. The factory 31L82 is built to Lennox's exact pressure, voltage, and connection standards, ensuring safe, reliable ignition and preserving your equipment warranty. For a component this important, OEM is the only correct choice.