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The genuine OEM Lennox Y8117 gas valve manages the flow of gas to your furnace burners, opening on a signal from the ignition control to provide safe, properly metered fuel for combustion. As a factory-specified component, it is built to the exact pressure, flow, and voltage requirements of your Lennox equipment so the burners light cleanly and hold a stable flame throughout each heating cycle.
Indicators of a worn or failed gas valve include a furnace that won't ignite, burners that ignite then extinguish, weak or delayed ignition, no heat, or repeated ignition lockouts. An audible click with no gas delivery, or a valve stuck open, are further signs the Y8117 needs replacement.
Because the gas valve is a safety-critical part, installing the OEM Lennox Y8117 is important. Generic alternatives may not match the precise gas regulation, coil rating, or fittings your system requires, risking unsafe combustion, nuisance faults, and possible warranty issues. The factory part restores rated, dependable performance to your Lennox furnace.