1. The entrance and export valves of the thermal pump are not opened, the entry and exit pipes are blocked, and the abortion impeller is obstructed. Solution to remove obstructions.

2. Insufficient import and export water supply, high suction, bottom valve leak water. Disclosure inspection and adjustment (this phenomenon is easy to occur from the water pipe and the inhalation process).

3. The pump is not filled with liquid, and there is air in the pump cavity. Open the cover or open the exhaust valve to discharge the air.

4. Hot water circulating pump inhalation tube leakage. Tighten each cover and rule out the air.

5. The direction of the motor is wrong, and the speed of the motor is very slow. Adjust the direction of the motor and the sturdy motor wiring.

6. Excessive pipe resistance, improper selection of centrifugal pumps. Reduce the tube curve and re -select the pump.