Applicable: This FDXLICB1930 FD integrated control board is suitable for H series low nox pool heater models such as H150FDN H150FDP H250FDN H250FDP H300FDP H350FDN H350FDP H400FDN H400FDP Replace OEM part number FDXLICB1930 Function: This replacement integrated control board has a unique design that uses PCB manufacturing, soldering, and assembly technology. After multiple tests, it can reduce the running time of the pump without interrupting the heating process, thereby achieving energy saving. At the same time, it can make the water flow velocity uniform in all pipelines, achieving rapid heating. Installation: Easy to install, this is a complete integrated control board. After removing the old parts, it can be installed directly according to the original circuit. Before installation, be sure to turn off the power first (there is an instruction manual included) Note: This product is suitable for IDL heaters manufactured after September 20, 2004. If your heater model ends with FDN or FDP, this product will meet your replacement needs.