Lennox 70L55 Ignitor Assembly

The Lennox 70L55 Ignitor Assembly is a critical OEM replacement component designed for high-efficiency gas furnaces. A veteran technician knows that a cracked or fouled ignitor is the most common cause of "no-heat" calls. This hot surface ignitor (HSI) features a robust silicon carbide or nitride construction to withstand the thermal stress of rapid heating cycles. Engineered to 120V AC specifications, it provides the precise resistance—typically between 39 and 70 ohms—required to reach ignition temperatures in seconds. The Lennox 70L55 is 100% identical to the Honeywell Q3400A1008, ensuring seamless cross-compatibility for maintenance in the field. This assembly includes an 18-inch lead with a secure Molex connector for direct-fit installation, minimizing time spent at the unit and ensuring the furnace ignition system operates with original factory reliability.

• OEM Precision: Direct replacement for the Honeywell Q3400A1008, maintaining factory safety and performance standards.
• Extended Durability: High-grade ceramic materials engineered to resist oxidation and thermal shock during the heating season.
• Standard Plug-and-Play: Pre-terminated 18-inch wiring harness avoids the need for field splicing or re-pinning.
• Optimal Performance: Reaches maximum temperature in under 20 seconds, ensuring prompt gas burner ignition and preventing "lockout" codes like Lennox E207.

• Why is my furnace throwing an E207 error code? This code indicates an "open" ignitor circuit. Use a multimeter to check for resistance; if it reads infinite ohms, the 70L55 assembly is likely cracked and requires immediate replacement.
• Can I use this to replace a standard 80V ignitor? No. This is a 120V component. Installing it in an 80V system will result in inadequate heating for ignition, while putting it in a system with incorrect voltage can damage the control board.
• Do I need to clean the ignitor? Never touch or clean the element with bare hands. Skin oils create "hot spots" that cause premature failure. If the element is fouled, replacement is the industry-standard recommendation.

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.