Ensure reliable furnace operation with the Lennox 69W43 (LB-74940B) Flame Sensor Kit. Designed specifically for compatibility with select Lennox heating systems, this OEM replacement part accurately detects burner flame presence, helping to prevent unsafe operation and system lockouts. The kit includes the flame sensor and necessary components for quick, secure installation—restoring your system's safety features and efficiency. Built to Lennox’s exacting standards, the 69W43 sensor delivers dependable performance and long-term durability.

Key Features:

Genuine Lennox OEM flame sensor kit

Part numbers: 69W43 / LB-74940B

Detects burner flame to ensure safe ignition

Prevents false flame errors and furnace shutdowns

Includes mounting hardware for easy installation

Compatible with select Lennox furnace models

Maintain your furnace’s safety and performance—choose the trusted reliability of Lennox original parts from Beenimax.com.