There are several reasons why the water cannot be pumped: 1. There is no water or too little water in the water storage tank. 2. The water supply pump or control system is broken, and the water storage tank cannot be replenished in time, resulting in no water or too little water in the storage tank. 3. The pressurized air pump or control system is broken, which can't provide pressure and stabilization for the constant pressure water storage tank, so that the water in the tank can't be sent out. 4. Water source problem. If it is a deep well water source, the water level is too low, the pump head is insufficient and other reasons lead to the inability to supply water to the system; Generally, the municipal tap water source is the pump failure or the valve is not opened, which makes it impossible to supply water to the system.