Lennox 31J35 Pilot Assembly

The Lennox 31J35 Pilot Assembly is a factory-authorized OEM replacement part engineered specifically for residential and light commercial gas furnaces, including the G20 series and G20R models. As a critical intermittent pilot ignition component, this assembly replaces previous part numbers 31J3501 and NCO-31J35, ensuring seamless mechanical compatibility with your existing gas burner configuration. This Lennox 620 pilot assembly features a factory-calibrated 0.02-inch orifice and a durable L-shaped mounting bracket for stable flame characteristics and precise electrode positioning.

For technicians troubleshooting ignition failures or weak pilot flames, this genuine Lennox part provides a 28-inch lead length for flexible wiring to the control module. By utilizing high-temperature resistant materials, the assembly survives the thermal stress typical of frequent ignition cycles in high-efficiency systems. Installing this exact-fit Lennox pilot burner with electrode maintains the operational integrity and safety standards specified for the original heating unit, preventing downstream issues with the flame sensor or main gas valve activation.

• Direct OEM Compatibility: Precisely replaces Lennox 31J3501 and 620 series assemblies for a perfect fit.
• Precision Ignition: Integrated pre-mounted electrode ensures reliable spark delivery for intermittent pilot systems.
• Calibrated Performance: Features a 0.02" fixed orifice to maintain the correct gas-to-air ratio for a stable pilot flame.
• Rugged Construction: Built with an L-shaped bracket and high-grade materials to resist warping and heat degradation.
• Safety Compliance: Meets the manufacturer's original technical specifications for proper furnace sequence of operation.

Will this assembly work for a standing pilot furnace?
No, the 31J35 is specifically designed for intermittent pilot ignition (IPI) systems where the pilot only stays lit while the call for heat is active. It is not compatible with older standing pilot units.

Why is my pilot flame orange instead of blue?
An orange flame often indicates a clogged orifice or carbon buildup. Replacing the entire 31J35 pilot burner assembly ensures a clean 0.02" orifice and proper flame rectification through the integrated electrode.

Does this part include the mounting hardware?
The assembly includes the pre-attached L-bracket and ignition lead. You should retain the original mounting screws from the furnace burner manifold for installation.

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.