The cable used should have 6mm min. 9mm max. Outside diametre, In order to guarantee the water tight enclosure to the box.When the unit is connected to the electrical network, the green led power on light up and the yellow led On pump in operation.The starting operation archived the unit is programmed to perform all the pump control operation automatically. When particular operation breakdowns occur, such as water failure, obstruction of the suction pipe etc., The units recognizes the breakdown the red led failure lights up at the same time a stop signal is sent to the pump to prevent damages caused by its working in the absence of water. Ratification of the failure that have caused the blockage , allows the system to be restarted by pressing the restart button