The Noritz NPJ231 CB-PCB Control Board is a genuine OEM electronic control module designed for Noritz CB-series combination boilers and tankless water-heating equipment. It processes signals from sensors and safety components, then coordinates functions such as ignition, gas-valve operation, temperature regulation, flame monitoring, and system diagnostics. This replacement PCB helps r... https://www.partshnc.com/noritz-npj231-cb-pcb-control-board