Lennox 21L98 Ignitor Electrode

The Lennox 21L98 Ignitor Electrode is a critical furnace component designed for precise direct spark ignition (DSI) sequences in high-efficiency residential and commercial units. This genuine OEM part, which is cross-referenced and identical to Lennox 21L9801, ensures the correct spark gap and flame rectification required for consistent burner light-off. Unlike generic alternatives, the 21L98 is engineered with high-grade ceramic insulation to prevent voltage leakage and a durable electrode tip capable of withstanding the thermal stress of repeated firing cycles. When troubleshooting lockout codes or poor flame sensing, replacing the worn or cracked electrode is often the first step in restoring system reliability. Proper alignment and gap settings are vital to maintaining the microamp signal necessary for the control board to verify combustion. This ignition assembly is built to meet the rigorous specifications of Lennox equipment, ensuring compatibility with your current gas valve and burner manifold configuration.

Key Benefits

• Ensures reliable gas furnace ignition by providing a consistent high-voltage spark.
• Features high-temp ceramic housing to maintain electrical integrity during high-load periods.
• Simplifies repairs as a direct-fit replacement for Lennox 21L9801 ignitor assemblies.
• Maintains accurate flame rectification to prevent nuisance system shutdowns.
• Designed for long-term resistance to carbon buildup and oxidation in the combustion chamber.

Common Questions

Is the Lennox 21L98 compatible with the 21L9801?
Yes, these part numbers are interchangeable. The 21L98 is the exact same component as the 21L9801, meeting all factory specifications for fit and function.

Why is my furnace failing to sense flame with a new ignitor?
If the flame sensor integrated into the electrode is dirty or if there is a grounding issue, the control board will not detect the flame and will trigger a safety lockout. Ensure the ceramic is not cracked and the wire leads are secure.

What causes an ignitor electrode to fail prematurely?
Stress from thermal expansion, moisture in the combustion air, or cracks in the ceramic insulator can lead to failure. Regular inspection of the electrode tip for erosion is recommended during annual maintenance.

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.