The NORITZ SKJ72QD Flame Lifting Detection is a flame-sensing component designed for compatible Noritz tankless water heaters. It monitors the burner flame by detecting flame conditions and helps the heater’s control system identify abnormal flame lifting or unstable combustion. This component is used in select Noritz gas-fired tankless water heater systems, including compatible NCC, ... https://www.partshnc.com/noritz-skj72qd-flame-lifting-detection