1. Check water pump supply conductors, if there is aging, damaged, leakage copper core power cable. In this case, if the shore power line, can be wrapped on the package. If the water is preferably Replace cable often Check the pump impeller for dirt, foreign objects, such as blocking the impeller or the water outlet, check the sound of the pump is running well, if there are unpleasant sound, indicating damage to the pump bearing, repair, refueling, replacement Check pump running leakage If the leakage please send maintenance department overhaul. There are three reasons for abnormal noise. One pump bearing damaged, need to be replaced. Two. Pump impeller loose, mill to pump the bottom end of the water. Three. Pump coil damage 3. The pump can not be normal water supply for four reasons First, the pump is not a centrifugal pump . Whether the need for water diversion work, Second, the pump is reversed, if it is reversed, replace the capacitor connector method. Third, the pump outlet or impeller gap in the foreign body. Fourth, the pump seal is safe.