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5. The pump
performance is not
constant.
a) The pump inlet pressure is too low
(cavitation).
Check the inlet conditions.
b) The inlet pipe or pump is partly
blocked by impurities.
Clean the inlet pipe or pump.
c) The pump draws in air. Check the inlet conditions.
6. The pump runs, but
gives no water.
a) The inlet pipe or pump is blocked by
impurities.
Clean the inlet pipe or pump.
b) The foot or non-return valve is
blocked in closed position.
Repair the foot or non-return valve.
c) There is a leakage in the inlet pipe. Repair the inlet pipe.
d) There is air in the inlet pipe or pump. Check the inlet conditions.
e) The motor runs in the wrong direction
of rotation.
Change the direction of rotation of
the motor.
7. The pump runs
backwards when
switched off.
a) There is a leakage in the inlet pipe. Repair the inlet pipe.
b) The foot or non-return valve is
defective.
Repair the foot or non-return valve.
8. Leakage in the shaft
seal.
a) The shaft seal is defective.
Replace the shaft seal.
9. Noise. a) Cavitation. Check the inlet conditions.
b) The pump does not rotate freely due
to frictional resistance as a result of
incorrect pump shaft position.
Adjust the pump shaft as described
in the service documentation. See
section 6.2 Service documentation.
c) Frequency converter operation. See the instructions for the motor
which are supplied with the pump.
Fault Cause Remedy
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