Lennox 33J37 Ignitor

For high-demand service calls involving Lennox gas furnaces, the Lennox 33J37 Hot Surface Ignitor is a critical OEM replacement component. Engineered from durable silicon carbide, this 120V ignitor is designed to withstand the rigorous thermal cycling of modern heating systems. It features 36-inch leads with a specialized 2-pin ceramic block connector, ensuring a precise fit for compatible Armstrong Air, Ducane, and Concord units as well. As a direct crossover for part number 33J3701, this component provides the rapid heating action required to reach ignition temperature consistently, eliminating reliance on standing pilot lights. When troubleshooting furnace ignition failure or E207 error codes, technicians should check for a resistance range of approximately 40 to 75 ohms. To maintain the integrity of the silicon surface, always handle the assembly by the ceramic base, as skin oils can cause hot spots and premature failure. This genuine Lennox part ensures your equipment operates at peak combustion efficiency throughout the heating season.

• OEM Compatibility: Precision-fit for Lennox G24M and G25MV5 series, as well as select Allied Air platforms.
• Reliable Ignition: High-grade silicon carbide element reaches temperature quickly for consistent burner light-off.
• Simplified Installation: Includes a universal mounting bracket and pre-terminated leads to minimize time on the job site.
• Enhanced Safety: Modern electronic ignition design reduces gas consumption and mitigates risks associated with manual pilot systems.

• What is the proper resistance for a Lennox 33J37 ignitor? A functional 33J37 ignitor typically registers between 39 and 75 ohms. If your multimeter shows infinity (open circuit) or resistance significantly outside this range, the element is likely cracked or degraded and requires replacement.
• Can I use this in Armstrong or Ducane furnaces? Yes, the 33J37 is the official OEM replacement for several Armstrong Air and Ducane models that utilize the 33J3701 part number. Always verify the connector type and lead length before installation.
• Why does my new ignitor keep failing? The most common cause is "fingerprinting." Touching the silicon carbide element leaves oils that create localized heat zones, leading to cracks. Always use the ceramic base or clean gloves during the swap.

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.