OEM Lennox Hot Surface Ignitor — 41K56

The genuine OEM Lennox 41K56 hot surface ignitor is the component responsible for lighting the burners in your Lennox gas furnace. When the thermostat calls for heat, this ignitor heats to a glowing temperature to ignite the gas and start the heating cycle. It is engineered as a direct-fit replacement for compatible Lennox furnaces, ensuring correct resistance, positioning, and ignition timing.

Common failure symptoms: If the 41K56 ignitor fails, you may notice the furnace blower running with no heat, a visibly cracked or broken ignitor element, no glow during the ignition sequence, or the furnace locking out after several failed ignition attempts. Hot surface ignitors are among the most common wear items in gas furnaces and are prone to cracking from thermal cycling and hairline stress fractures over time.

Why OEM matters: Aftermarket ignitors often have incorrect resistance values or mounting geometry that lead to premature failure or improper burner ignition. Choosing the genuine Lennox 41K56 guarantees precise fit and factory-rated performance, protecting your furnace control board and delivering safe, dependable heat for your Lennox equipment.