Description
This is an Lennox/Armstrong/DucaneFurnace Flame Sensor. This flame sensor fits MANY furnaces. The part number is 903600 which replaces part #s 31L71 31L7101 & LB-74940A. The total lenth of the flame sensor is 5 inches.
Function:
A flame sensor senses the furnace flame ensuring that ignition has occurred. It then monitors the flame until the furnace shut down. Should combustion be disrupted for any reason the sensor loses its signal and shuts the gas valve off.
Replaces Old Part #s:
31L71 31L7101 LB-74940A
Repair Difficulty Level:
Partial List of Units that Use This Item:
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