Fault Cause Remedy
There is air in the pump or the
inlet pipe.
Vent the pump and the inlet pipe.
Increase the stop level in the pit.
The pumped liquid is too
dense.
Dilute the pumped liquid.
The pump is improperly
connected to the auto
coupling.
Pump down the liquid level in the
pit. Lift out the pump and place it
on the auto coupling again.
There is leakage in the pipes. Repair the pipes.
The pit flushing system is
inadvertently activated.
Check the function of the pit
flushing system and repair it, if
required.
The pump starts, but stops immediately.
The pump is clogged, which
causes the motor-protective
circuit breaker to trip.
Clean the pump.
The motor is overheated,
which causes the thermal
switches to trip.
Allow the pump to cool. Clean the
pump.
The level switch is out of
adjustment or defective.
Clean or set the level switch or
replace them, if required.
The pump is vibrating or emitting
excessive noise.
The pump is partly clogged by
impurities.
Clean the pump.
The direction of rotation is
wrong.
Interchange two phases to the
motor.
The pump is operating outside
the specified operating range.
Re-establish proper operating
conditions.
The pump is defective.
Repair the pump or contact an
authorised workshop, if
necessary.
The pump is not properly
connected to the auto
coupling.
Pump down the liquid level in the
pit. Lift out the pump and place
the pump on the auto coupling.
The pump is cavitating. Clean the inlet pipe.
The impeller is not in balance.
Contact an authorised service
workshop.
The base stand, the auto
coupling, the ring stand or the
guide rails are installed
incorrectly.
Install the components correctly.
Low motor liquid level.
The upper mechanical shaft
seal is leaking.
Contact an authorised service
workshop.
30
English (GB)
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