Lennox 18G90 Pilot Assembly

The Lennox 18G90 Pilot Assembly is a high-performance OEM replacement engineered for precise ignition control in natural gas furnace systems. Designed for demanding residential and commercial HVAC applications, this pilot burner with electrode features a factory-calibrated 0.018-inch orifice to ensure a stable and consistent flame pattern for efficient combustion. This assembly is a critical component for technicians addressing ignition failure or delayed burner start-ups, particularly in the Lennox G-series and WhisperHeat units. The integrated ceramic electrode provides a reliable spark for intermittent pilot systems, while the 24-inch high-temperature ignition lead simplifies housing connections during field swaps. By utilizing genuine Lennox 18G90 parts, contractors can restore original manufacturer specifications and prevent common nuisance trips related to pilot flame sensing. Its durable, heat-resistant construction is specifically built to withstand the high-thermal environments of the modern combustion chamber, ensuring long-term reliability in the field.

• Optimized Ignition: Features a precision 0.018" orifice for a focused, stable pilot flame.
• Broad Compatibility: Genuine Lennox replacement part designed for a wide range of natural gas furnaces and boilers.
• Integrated Electrode: Includes a high-durability ceramic electrode and 24-inch lead for direct plug-in installation.
• Improved System Reliability: Solves chronic burner ignition issues and prevents safety-related system lockouts.
• Technician-Ready: OEM fit ensures no modifications are required to the existing burner bracket or gas line.

Is the 18G90 compatible with LP (Propane) systems?
No, this specific assembly is factory-drilled with a 0.018" orifice intended exclusively for natural gas applications. Converting to LP would require a different orifice size to maintain the correct BTU input and flame stability.

What are the signs that my current pilot assembly is failing?
Common symptoms include the furnace short cycling, hearing a continuous spark without pilot flame ignition, or a "weak" pilot flame that fails to reach the flame sensor, causing the gas valve to shut down as a safety precaution.

Does this assembly include the sensing electrode?
Yes, the 18G90 is a complete pilot burner assembly that includes the integrated electrode and the pre-attached ignition wire lead for a seamless replacement process.

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.