Lennox 18G89 Flame Sensor for Gas Furnaces

The Lennox 18G89 Flame Sensor is a genuine OEM replacement component designed to ensure safe and reliable operation of your gas furnace. This critical safety device monitors flame presence during the combustion cycle, preventing unsafe operating conditions by shutting down the system if no flame is detected.

Key Features:

• Straight style flame sensor with 3-1/4 inch total length and 13/16 inch element length
• Constructed with high-quality Kanthal D or Hoskins 815 electrode material for durability and heat resistance
• Steatite housing material withstands high temperatures and harsh operating conditions
• Provides direct flame detection for accurate, reliable furnace operation
• Easy installation with universal fit for compatible Lennox models

This flame sensor is compatible with Lennox G12, G16, G20, and G23 series furnaces. It replaces obsolete Lennox part number 18G8901 and is also compatible with Allied, Armstrong, Concord, and Ducane equipment. Cross-reference part numbers include 65206300, 1245509251, 36T01B7, L164-30F, T-O-D, 47567, A1245, 1828, and LN9.

When flame sensors become dirty or worn over time, furnaces may fail to ignite or experience intermittent operation. Replacing a faulty flame sensor restores proper system operation and maintains safe, efficient heating performance.