Hi Please read the catalogue, brochure and the instructions with the system, are you ensuring that the AQUAvalve is secured in the tray, the half-moon at the back/bottom of the AQUAvalve needs to be pushed onto the tee section in the tray where the AQUAvalve is located and push down firmly on the main body of the AQUAvalve to ensure it is connected to the tee.