Lennox 41K56 Ignitor

The Lennox 41K56 is a mission-critical Silicon Carbide Hot Surface Ignitor (replaces 41K5601 and LB-109261A) designed for high-performance combustion in Lennox furnace ignition systems. Built to withstand the rigorous cycling of residential and light commercial units, this genuine OEM Lennox 41K56 component operates at 80V and 92 watts to ensure rapid, reliable ignition of the burner assembly. This specific SureLight furnace ignitor features a robust steatite ceramic insulator and comes equipped with 11-inch white Teflon-coated leads and a 2-pin AMP receptacle with .084 female sockets for a secure, plug-and-play connection.

As a veteran tech, you know that hot surface ignitor replacement is a primary fix for "no heat" calls. The 41K56 is the factory-spec for a wide range of popular models including the Lennox G24, G26, G32, G40, G51, and G61 series. Its high-density composition provides superior thermal conductivity, though internal resistance should typically measure between 10.9 and 19.7 ohms at room temperature. Proper handling is vital; avoid touching the element to prevent skin oils from creating hot spots that lead to premature stress and failure.

Key Benefits for HVAC Professionals

• Direct OEM Match: Ensures precise fit and timing for Lennox 41K5601 applications without needing field modifications to brackets or wiring.
• SureLight Technology: Engineered for the specific voltage ramps of Lennox SureLight ignition controls, preventing nuisance lockouts.
• High-Temp Leads: Features 11-inch Teflon-insulated wiring to resist lead-wire degradation near the burner box.
• Wide Compatibility: Standardized for 80V systems across Lennox, Armstrong, and Allied Air furnace platforms.

Common Questions

How do I confirm if my Lennox 41K56 ignitor has failed?
Inspect the element for visible cracks or white "hot spot" crystallization. If it looks intact, use a multimeter to check for continuity. A reading of "OL" or high resistance outside the 10-20 ohm range indicates the silicon carbide has reached its end of life.

Can I use a 120V ignitor as a substitute for the 41K56?
No. The Lennox 41K56 is an 80V ignitor. Installing a standard 120V part will result in insufficient heat for ignition, while using a high-voltage part on an 80V circuit can damage the integrated furnace control board.

Why does my furnace click several times but fail to light?
This is often a symptom of a weakened hot surface ignitor that can no longer reach the required 1,800°F–2,500°F to ignite the gas. Replacing the component with a genuine 41K56 typically restores the combustion sequence.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.