Lennox 12F19 Flame Sensor this unit ensures reliable switching

this unit ensures reliable switching for compressors

preventing the operation of the gas valve if flue gas venting is obstructed or the inducer blower fails

Using a standard socket wrench

meaning it will automatically close the circuit once the sensed temperature falls below the reset point

Comprehensive gasket assembly reduces downtime by providing all necessary sealing components in one package

Lennox 12F19 Flame Sensor this unit ensures reliable switchingThe Lennox 12F19 Flame Sensor is a critical safety component designed for precise flame rectify detection in residential and commercial gas fired heating systems. This genuine OEM part is engineered to monitor the burner's pilot or main flame, sending a continuous microamp signal to the furnace control board. If the 12F1901 furnace sensor fails to detect a flame, it immediately signals the gas valve to shut down, preventing hazardous gas accumulation.