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The genuine OEM Lennox Y8351 is a SIG DS010KX hot surface igniter that ignites the burners on your Lennox gas furnace. When the thermostat calls for heat, the igniter energizes and glows red-hot to light the main gas burners at the start of each heating cycle. A properly rated igniter is essential for fast, reliable ignition and consistent furnace performance.
Common failure symptoms: the furnace blower runs but produces no heat, you hear the gas valve click without the burners lighting, the furnace goes into ignition lockout after several failed attempts, or the igniter appears cracked, blistered, or fails to glow. Hot surface igniters are a common wear item that degrades with repeated thermal cycling.
Why OEM matters: Lennox ignition control boards are matched to the resistance and heat-up profile of the specified igniter. The factory Y8351 ensures correct current draw, glow temperature, and timing so the board's ignition sequence works reliably. Substitute igniters with different electrical characteristics can cause slow starts, delayed ignition, or premature failure — making the genuine OEM part the dependable, safe replacement.