Lennox 69W43 Furnace Flame Sensor – OEM Ignition Safety Component
The Lennox 69W43 Flame Sensor is an OEM ignition safety part designed to detect the presence of a burner flame in gas furnace systems. By verifying that the flame is present after ignition, this sensor helps prevent unburned gas from accumulating and protects your home and HVAC equipment.
This flame sensor features precise rod measurements for compatibility with a wide range of Lennox models. The rod measures 1-15/16" to the elbow, and 4-5/16" from the base plate to the elbow, ensuring a proper fit and consistent performance.
If you're experiencing ignition lockouts or intermittent heating, a faulty flame sensor may be to blame. Replacing it with the 69W43 restores reliable furnace operation and helps maintain energy efficiency and safety.
Key Features:
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OEM Lennox flame sensor for gas furnaces
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Verifies flame presence to support safe operation
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Helps prevent ignition failure and system lockouts
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Compatible rod sizing:
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1-15/16" from rod tip to elbow
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4-5/16" from base plate to elbow
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Durable construction for long-term use
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Easy to install and field-replaceable
Alternate / Replacement Part Numbers:
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69W4301
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LB-74940B
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LB74940B
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102431-02
Ensure reliable furnace ignition and safe heating performance with the Lennox 69W43 flame sensor—engineered to OEM specs for precise flame detection.
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