Lennox 27L41 Ignitor/Flame Sensor Kit

When you are troubleshooting a no-heat call on a Lennox G24 or G26 series furnace, a failing Lennox 27L41 Ignitor/Flame Sensor Kit is often the culprit. This genuine OEM replacement kit is engineered for precision, featuring a silicon nitride ignitor that provides superior durability over older carbide models. The L-shaped ignitor measures 1 11/16 inches, while the included straight-style flame sensor features a 1 1/4-inch rod for accurate microamp signal feedback to the integrated furnace control. This assembly ensures the 120V ignition sequence performs reliably under high-temperature demands, preventing nuisance lockouts caused by carbon buildup or fractured heating elements. By replacing both the furnace ignitor and the flame sensor simultaneously, you restore the system to factory specifications and ensure proper flame rectification. The kit includes the necessary 84K49 gaskets to maintain a proper seal on the burner box, making it a comprehensive HVAC replacement part for high-efficiency Lennox units. Professionals trust this Lennox furnace part for its exact fit and consistent resistance values across extreme thermal cycles.

Key Benefits

• OEM Compatibility: Specifically designed for Lennox heating systems, including model HM30-100-1 and the G24/G26 furnace series.
• Durable Silicon Nitride: The upgraded material offers higher thermal shock resistance compared to standard silicon carbide ignitors.
• Complete Assembly: Includes the Lennox 27L41 ignitor/sensor combo and two 84K49 mounting gaskets for a direct, leak-free installation.
• Precision Detection: The rod-style flame sensor delivers stable flame rectification signals to prevent intermittent system shutdowns.

Common Questions

Check the data plate inside your furnace cabinet for the model number. This kit is a direct OEM match for many Lennox residential furnaces requiring an L-shaped ignitor and a 1 1/4-inch flame sensor rod. Comparing the physical dimensions and connector type of your existing part is the best way to confirm a match.

While cleaning a sensor with steel wool is a temporary fix, microscopic pits in the metal can lead to rapid re-oxidation. Replacing the entire ignitor and flame sensor kit ensures the ignition system operates at peak reliability, especially since ignitor resistance increases as the component nears the end of its service life.

Most failures result from high-temperature oxidation, moisture in the combustion air, or simple fatigue from thousands of ignition cycles. A cracked ignitor or a coated flame sensor will prevent the burner from staying lit, necessitating a Lennox 27L41 swap.

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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.