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Troubleshooting the Water Pump

Fault

Checks (Possible causes)

Remedy

1. The pump does not run

a) Supply failure	Switch on the switch Check Cables and cable connections for defects and loose connection
b) Fuses are blown	Check Cables and cable connection for defects, and replace the fuses
c) Motor protection tripped	Check Cables and cable connection for defects, and replace the fuses Replace the contacts of the motor-protective circuit breaker, the magnet coil or the entire motor-protective circuit breaker Check cables and cable connections for defects, and replace the fuses Repair or replace the motor Switch off the power supply, and clean or repair the pump Set the motor-protective circuit breaker according to the rated current of the motor
d) Control-current circuit detective	Repair or replace the control-current circuit

2. Motor-protective circuit breaker has tripped (trips out immediately when supply is switched on)

a) Fuses are blown	Check Cables and cable connection for defects, and replace the fuses
b) Contacts of the motor-protective circuit breaker or magnet coil defective	Replace the contacts of the motor-protective circuit breaker, the magnet coil or the entire motor-protective circuit breaker
c) Cable connection is loose or faulty	Check cables and cable connections for defects, and replace the fuses
d) Motor winding is defective	Repair or replace the motor
e) The pump mechanically blocked	Switch off the power supply, and clean or repair the pump
f) The setting of the motor-protective circuit breaker is too low	Set the motor-protective circuit breaker according to the rated current of the motor

3. The motor-protective circuit breaker trips out occasionally

a) The setting of the motor-protective circuit breaker is too low	Set the motor-protective circuit breaker according to the rated current of the motor
b) Periodic supply failure	Check cables and cable connections for defects, and replace the fuses
c) Periodically low voltage	Check cables and cable connections for defects and loose connections. Check that the supply cable of the pump is correctly sized

4. The pump performance is unstable

a) Pump inlet pressure too low	Check the inlet conditions of the pump
b) Suction pipe is partly blocked by impurities	Remove and clean the suction pipe
c) Leakage in suction pipe	Remove and clean the suction pipe
d) Air in suction pipe or pump	Vent the suction pipe/pump. Check inlet conditions of the pump

5. The pump runs, but gives no water

a) Pump inlet pressure too low	Check the inlet conditions of the pump
b) The suction pipe is partly clogged by impurities	Remove and clean the suction pipe
c) The foot or non-return valve is stuck in its closed position	Remove and clean, repair or replace the valve
d) Leakage in suction pipe	Remove and repair the suction pipe
e) Air in suction pipe or pump	Vent the suction pipe/pump. Check the inlet conditions of the pump

6. The pump runs backwards when switched off

a) Leakage in suction pipe	Remove and repair the suction pipe
b) Foot or non-return valve defective	Remove and repair the suction pipe
c) The foot valve is stuck in completely or partly open position	Remove and repair the suction pipe

7. The pump runs with reduced performance

a) Wrong direction of rotation	Three-phase pumps only: Switch off the power supply with the external circuit breaker, and interchange two phases in the pump terminal box. See also section 8.2 Checking the direction of rotation
b) Pump inlet pressure too low	Check the inlet conditions of the pump
c) The suction pipe is partly clogged by impurities	Remove and clean the suction pipe
d) The foot or non-return valve is stuck in its closed position	Remove and clean, repair or replace the valve
e) Leakage in suction pipe	Remove and repair the suction pipe

8. The green “Power on” indicator light is off

a) The fuss is electric installation have burnt	Replace the fuses. If the new fuses also burn, check the electric installation
b) The earth leakage circuit breaker or the voltage-operated circuit breaker has tripped out	Cut in the circuit breaker
c) No power supply	Contact the power supply authorities
d) The press control is defective	Repair or replace the PM unit

9. The green “Pump on” indicator light is on, but the pump does not start

a) The power supply to the pump is disconnected after the Press Control	Check the plug and cable connections, and check if the built-in circuit breaker of the pump is switched off
b) The motor protection of the pump has tripped out due to overload	Check if the motor/pump is blocked
c) The pump is defective	Repair or replace the pump
d) The press control is defective	Repair or replace the press control

10. The pump does not start when water is consumed. The “pump on” indicator light is off

a) Too big difference in height between the Press Control and the tapping point	Adjust the installation, or select a Press control with higher start pressure
b) The Press Control is defective	Repair or replace the Press Control

11. Frequent starts/stops

a) Leakage in the pipework	Check and repair the pipework
b) Leaky noon-return valve	Clean or replace the non-return valve
c) A valve close to the PM1 outlet has been closed	Open the valve

12. The pump does not stop

a) The pump cannot deliver the necessary discharge pressure	Replace the pump
b) A Press control with too high start pressure is installed	Select a Press Control with lower start pressure
c) The Press control is defective	Repair or replace the Press Control
d) The non-return valve is stuck in open position	Clean or replace the non-return valve

13. The red “Alarm” indicator light is permanently on

a) Dry running. The pump needs water	Check the pipework
b)The power supply to the pump is disconnected after the Press Control	Check the plug and cable connections, and check if the built-in circuit breaker of the pump is switch off
c) The motor protection of the pump has tripped out due to overload	Check if the motor/pump is blocked
d) The pump is defective	Repair or replace the pump
e) The Press Control is defective	Repair or replace the press control

14. The red “Alarm” indicator light is flashing

a) Cycling. A tap has not been closed entirely after used