2. The motor runs in the wrong direction, and the motor rotates very slowly due to lack of phase. Adjust the direction of the motor and strengthen the motor wiring.
3. The suction pipe of the hot water circulation pump is leaking. Tighten each sealing surface to remove air
4. The pump is not filled with liquid, and there is air in the pump cavity. Open the upper cover of the pump or open the exhaust valve to exhaust the air.
5. The inlet and outlet water supply is insufficient, the suction stroke is too high, and the bottom valve is leaking. Shutdown inspection and adjustment (this phenomenon is prone to occur when the water pipe is connected to the grid and the use with suction lift).
6. The pipeline resistance is too large, and the centrifugal pump is improperly selected. Reduce pipe bends and reselect pump.
