Description
Armstrong Air 69W43 Furnace Flame Sensor – OEM Ignition Detection Probe
The Armstrong Air 69W43 Flame Sensor is a genuine OEM part designed to detect burner flame in gas furnace systems. This sensor plays a critical role in maintaining safe operation by confirming the burner is lit during the ignition cycle. If no flame is detected, the control board shuts off gas flow—preventing hazardous conditions and ensuring efficient operation.
Engineered to fit select Armstrong Air and allied brand furnaces, this sensor features the following dimensions: 1-15/16″ rod length to elbow and 4-5/16″ from base plate to elbow. Its stainless steel probe and durable ceramic base ensure long service life and dependable performance under high-heat conditions.
Key Features:
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OEM flame sensor for Armstrong Air gas furnaces
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Verifies flame presence during burner ignition
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Prevents ignition lockouts and safety shutdowns
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Rod length to elbow: 1-15/16″
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Length from base plate to elbow: 4-5/16″
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Durable stainless steel rod with ceramic insulation
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Quick and simple to install
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
If you’re experiencing failed ignition cycles or furnace short-cycling, the Armstrong Air 69W43 flame sensor provides a reliable OEM solution for restoring safe and consistent operation.
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