1

Pump reversal

Turn off the main power supply of the control box and replace any two-phase power cord

2

Head is too high

Check:

A. Is the pump type selected correct?

B. Is the size of the outlet pipe correct?

3

Delivery medium to bypass

Check whether bypass valve is closed and then test pump with full load

4

Leakage of Outlet Pipeline

Find the leak and solve it.

5

Local outlet pipeline may be blocked by deposited oxides

Check pipelines, clean and replace new ones

6

Local Blockage of Pump

Lifting pump cleaning, if the pump is placed in the package filter, also need to be checked and cleaned.

7

Too much wear on impeller and sealing ring

Replacement of impeller and sealing ring

1

       Air plug

A. Open and close the valve several times continuously.

B. Start/stop the pump several times, and the interval between each restart is not less than 10 minutes.

2

Inspection of effluent discharge valve

According to different installation methods:

A. Check whether an air release valve is required.

B. If the valve is closed, it should be opened.

3

Pump reversal

Turn off the main power supply of the control box and replace any two-phase power cord.

1

Floating Ball Switch (or Level Meter) Setting Time Too Short

Re-adjust float switch (or level gauge) to prolong operation time

2

Check valve failure, the check valve can not be checked, so that the liquid back into the sewage tank

Inspect and maintenan

1

Relay failure

Repair or replace

2

Fault of float switch (or level gauge)

Check whether the float switch (or level gauge) can start the pump. If not, check the float switch (or level gauge).

3

Winding, joint or cable break

Check with the OM table. If it turns out to be a circuit breaker, check the windings, terminals and cables.

4

Pump blocked

Cut off the power supply, remove the pump from the sewage tank and remove obstacles.

5

Leakage or leak blockade

Find out the cause and troubleshoot.

1

No electricity

A. Check whether the control box is electrified.

B. Check the control box carefully for any faults.

2

Breaking of windings, cables, wiring heads or control boxes

Check the connection and winding of cable and motor.

1

Floating Ball Switch (or Level Meter) "Stop" Function Failure

Check whether the float switch (or level gauge) can stop the pump. If not, check the float switch (or level gauge).

2

The float switch (or level gauge) is always in the "working" state.

Inspect and maintenan

1

Low Voltage

A. Check the voltage of the control box. If the voltage is too low, it can not be used temporarily.

B. If the cable is too long and the voltage drop is too large, the cable should be shortened as far as possible and the coarser cable should be selected appropriately.

2

Overvoltage

Install transformer to adjust voltage to specified range.

3

Incorrect connection of motor or confusion of connection

Check the cable color number and wiring head label in the control box, and check the wiring.

4

short circuit

Find out the cause and troubleshoot

5

Control box or capacitor failure

A. Check the control box carefully and forbid replacing the circuit breaker with components that exceed the recommended value.

B. If the control box fails, it should be repaired or replaced.

6

Mud or other sediments accumulated in the sewage tank

Clean up the sewage tank of the pump. See the relevant parts of the installation instructions.

1

Bearing wear

Replacement of bearings

2

Rotor unbalance

Check the reason, balance and fix the bolts of each part.

3

Installation system foundation strength is insufficient or pump installation is uneven

Reinforcing the foundation and leveling the pump.

4

Bending of Rotary Shaft

Send factory correction or replacement.