Lennox 59837 Flame Sensor Rod

When you are troubleshooting a Lennox furnace that is short-cycling or failing to stay lit, the Lennox 59837 Flame Sensor Rod is a critical diagnostic checkpoint. This OEM Lennox replacement part is engineered to provide precise flame rectification, sending a microamp signal to the ignition control board the moment the burner ignites. As a 6-inch flame sensing rod with a 3/16-inch diameter, it is built to withstand high-temperature combustion environments while preventing carbon buildup that leads to nuisance "no heat" service calls. This genuine furnace flame sensor replaces older part numbers including P-8-5784 and is a direct fit for a wide range of Lennox, Armstrong, Concord, and Ducane residential heating units. Using a genuine 59837 sensor ensures the electrical resistance matches factory specifications, maintaining the safety and integrity of the burner assembly without the risk of compatibility errors typical of universal "will-fit" components.

• OEM Compatibility: Precision-fit for Lennox 59837 and P-8-5784 specifications, ensuring seamless integration with existing furnace ignition modules.
• High-Temperature Durability: The 6-inch sensor rod is constructed from specialized alloys to resist oxidation and thermal stress in the burner flame.
• Improved Signal Accuracy: Ensures stable flame rectification signals (µA) to prevent intermittent system lockouts and furnace short-cycling.
• Broad Application: Engineered for use across multiple brands within the Lennox International family, including Allied, Armstrong, and Ducane.

What are the signs that a Lennox 59837 flame sensor is failing?
Usually, the furnace will ignite for a few seconds and then shut off immediately. If you observe the burner flame but the system still goes into lockout, the flame sensor rod is likely covered in soot or the ceramic insulator has cracked, preventing a clean signal to the board.

Can I clean the 59837 sensor rod instead of replacing it?
While cleaning with a light abrasive can temporarily restore operation, microscopic pitting on the metal surface will eventually cause rapid carbon accumulation. For long-term HVAC reliability, replacing the flame sensor is the industry-standard best practice to avoid repetitive callbacks.

Is this sensor compatible with my specific Lennox model?
The 59837 is widely used in G series and EL series Lennox furnaces. Always verify the part number against your existing burner assembly or service manual to ensure the rod length and mounting bracket align.

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.