9. Troubleshooting
DANGER
Electric shock
Death or serious personal injury
‐ Before starting any work on the
product, make sure that the power
supply is switched off and it cannot be
switched on unintentionally.
DANGER
Electric shock
Death or serious personal injury
‐ The pump must be grounded.
Before diagnosing any fault, make sure
that all rotating parts have stopped
moving.
Observe all regulations applying to pumps
installed in potentially explosive
environments.
Make sure that no work is carried out in
potentially explosive atmospheres.
Fault Cause Remedy
The pump does not start or stops without
visible cause.
No power supply.
Re-establish the power supply.
Start the pump manually.
The pump does not start or stops. The
control panel indicates that the motor-
protective circuit breaker or protection
equipment is tripped.
Missing phase. Re-establish all phases.
The pump is overloaded.
If the fault does not disappear
automatically, find the cause and
remedy the fault.
The impeller is clogged by
impurities.
Clean the impeller.
The motor-protective circuit
breaker is set incorrectly.
Set the motor-protective circuit
breaker according to the rated
current.
The thermal switches are
tripped. Insufficient motor
cooling.
Re-establish the motor cooling.
The moisture switch in the
motor is tripped.
Contact an authorised service
workshop.
The power cable is defective.
Contact an authorised service
workshop.
The voltage is fluctuating.
Re-establish the correct voltage
supply. Permissible deviation is ±
10 %.
The pump runs, but does not deliver the
rated flow.
The direction of rotation is
wrong.
Interchange two phases to the
motor.
The impeller is loose or worn. Tighten or replace the impeller.
The pump or the pipes are
blocked by impurities.
Clean the pump or the pipes.
The pump head is too high.
Measure the differential pressure
and compare the value with the
pump curve. Check that all valves
are open or remove any blockage
in the outlet pipe.
The valves are closed or
blocked. The non-return valve
is not operating.
Clean or replace the valves.
29
English (GB)
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