Abstract: A leak detection apparatus which is to detect a fluid leak in a closed fluid system and produce a display of the information of the leak on a display window of a control panel which may also be programmed to transmit that information to the human user such as a cell phone. The leak detection apparatus can be located in a closed position, not permitting flow of fluid within the closed fluid system, or in an open position permitting flow of fluid into the closed fluid system. During inactivity the closed fluid system is not capable of receiving fluid from a fluid supply pipe. During activity when fluid is being normally discharged from the closed fluid system the leak detection apparatus is to receive fluid from the fluid supply pipe.