The Bosch HVAC 63034010 Flame Discharge Sensor is a replacement safety component designed to monitor flame conditions in compatible Bosch heating equipment. It detects the presence or status of the burner flame and provides feedback to the control system, helping regulate ignition and combustion operation. This sensor is used in compatible boilers, furnaces, and gas-fired heating syst... https://www.partshnc.com/bosch-hvac-63034010-flame-discharge-sensor-128-c