The Laars Heating Systems W2014300 Flame Sensor Mascot LX is an OEM flame detection component designed for compatible Laars Mascot LX boilers and water heating systems. It works by sensing the presence of a burner flame and sending a signal to the ignition control module to verify safe combustion. If no flame is detected, it shuts down the burner to help prevent unsafe operation. https://www.partshnc.com/w2014300-laars-heating-systems-sensor-flame-mascot-lx