Lennox 17J57 Ignitor

The Lennox 17J57 Ignitor is a critical OEM replacement part engineered for high-performance spark ignition in compatible residential gas furnaces. Also identified by part number 17J5701 and cross-referenced as T6-2109, this component ensures consistent burner ignition across a variety of Lennox-built systems, including models from Armstrong and Ducane. As an L-style spark electrode, it features a 1 3/4-inch distance to the bend and a 2 3/4-inch total length, providing the precision gap required for reliable combustion. Constructed with a glazed L-5 steatite insulator and a copper-plated plate, it is built to withstand the thermal stresses of the furnace ignition system while maintaining electrical integrity. For technicians replacing HVAC furnace ignitors, this part offers a direct-fit solution that eliminates site-specific adjustments and supports optimal furnace repair outcomes. Ensure you verify the ignitor continuity and inspect the ceramic for cracks before completing the install to confirm the burner sequence is fully restored.

Key Benefits:

• Exact OEM Specifications: Direct replacement for 17J5701 and T6-2109, ensuring perfect alignment and gap distance.
• Enhanced Durability: Features a high-grade L-5 steatite insulator and nickel-plated steel terminals for resistance to oxidation.
• Broad Compatibility: Supports various equipment lines including Lennox gas furnaces, Armstrong, and Concord systems.
• Reliable Performance: Engineered for precision spark ignition to prevent delayed ignition or lockout events.

Common Questions:

Is the 17J57 compatible with the 17J5701?
Yes, the 17J57 is identical to the 17J5701 and can be used interchangeably in all specified furnace models.

What are the symptoms of a failing spark electrode?
Technicians typically observe "no-heat" calls where the furnace attempts to start but fails to produce a spark, often caused by cracked ceramic insulation or carbon buildup on the electrode tip.

Can I test this ignitor with a multimeter?
While hot surface ignitors are tested for ohms, spark electrodes like the 17J57 should be inspected for physical cracks in the insulator and proper electrical continuity to the terminal tip to ensure a high-voltage path exists.

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.