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The genuine OEM Lennox Y7760 is a White-Rodgers 21D64 Hot Rod universal silicon nitride hot surface igniter. Silicon nitride construction is far more durable and impact-resistant than traditional silicon carbide, delivering longer service life and rugged reliability in your Lennox furnace. As a universal HSI, it energizes to ignite the main burners each time the thermostat calls for heat.
Common failure symptoms: no heat despite the blower running, repeated ignition lockouts, burners that fail to light, or a visibly cracked or broken igniter element. Because it replaces fragile silicon carbide igniters, the Hot Rod is often chosen to end recurring breakage and callbacks.
Why OEM matters: the Y7760 is the Lennox-specified silicon nitride upgrade, engineered to match the current draw and glow characteristics your ignition control expects. Its 120V silicon nitride design resists the vibration and thermal shock that shatter older igniters, restoring dependable ignition. Using the genuine OEM part ensures correct compatibility and the long-life performance silicon nitride is known for.