Troubleshooting and fault elimination
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Troubleshooting and fault elimination
To avoid property damage and personal injury during the elimination of faults on the pump, the following
points must be heeded:
• Only eliminate a fault if you have qualified staff i.e. the individual jobs must be carried out by trained specialists
e.g. electrical work must be done by a qualified electrician.
• Always secure the pump against being started up again unintentionally by disconnecting it from the mains
power supply. Take suitable precautionary measures.
• Ensure that the pump safety switch-off can be carried out by a second person at all times.
• Secure the moving pump parts so that no-one can become injured.
• Unauthorised changes to the pump are made at your own risk and absolve the manufacturer from any
warranty claims.
Pump does not start
Cause
Remedy
Interruption in power supply, short-circuit or earth fault
on the cable and/or motor winding
Have a specialist check the cable and motor and renew
these if necessary
Fuses, motor protection switch and/or monitoring
devices have tripped
Have a specialist check the connections and change them if
necessary. Have motor protection switch and fuses installed
according to the technical specifications, reset monitoring
devices.
Check impeller/propeller for smooth running and clean and/or
make serviceable again
Pump starts up, but motor protection switch trips shortly after operation starts
Cause
Remedy
Thermal trigger on the motor protection switch is not set
properly
Have a specialist compare the setting of the trigger with the
techn. specifications and have them corrected if necessary.
Increased current consumption due to larger drop in
voltage
Have a specialist compare the voltage values of the
individual phases and have the connection changed if
necessary
2-phase running
Have a specialist check the connection and correct if
necessary
Differences in voltages too great at the 3 phases
Have a specialist check the connection and switchgear and
correct if necessary
Incorrect direction of rotation
Swap 2 phases of the mains cable
Impeller/propeller slowed by sticking, blockage and/or
solids, increased current consumption
Switch the pump off, secure it against restart, make impeller/
propeller serviceable again and/or clean suction muff
Density of the medium is too high
Consult the manufacturer
Pump is running, but not pumping
Cause
Remedy
No pumping medium available
Open inlet for tank and/or gate valve
Inlet blocked
Clean feed pipe, gate valve, suction adaptor, suction muff
and suction strainer
Impeller/propeller blocked or slowed
Switch the pump off, secure it against restart, make impeller/
propeller serviceable again
Defective hose/pipe
Replace defective parts
Intermittent operation
Check the switchgear
Pump is running, the given operating values are not being met
