a direct OEM replacement is the only way to restore reliable operation

and liquid temperature sensing via optional immersion wells

this specific model requires a 120V control signal to the coil

It is technically identical to the Honeywell 4074ELR/U

The Conbraco 10-418-15 carries the 'HV' symbol and is National Board capacity certified

Lennox 12F19 Flame Sensor a direct OEM replacement isThe 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.