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Fault: Pump does not start
1. Electricity supply interrupted or short-circuit/earth fault
in the cable or motor winding.
⇒ Have the connection and motor checked by a quali-
fied electrician and replace if necessary.
2. Tripping of fuses, of the motor protection switch or the
monitoring device
⇒ Have the connection and the monitoring device
checked by a qualified electrician and change it if
necessary.
⇒ Have the motor protection switches and fuses in-
stalled and adjusted according to the technical spe-
cifications by a qualified electrician and reset mon-
itoring device.
⇒ Check the impeller to make sure that it runs
smoothly, clean the hydraulics if necessary.
3. The sealing chamber control (optional) has interrupted
the electric circuit (connection-related)
⇒ See "Fault: Mechanical seal leakage, sealing cham-
ber control reports a fault and switches the pump
off".
Fault: Pump starts up, motor protection trips after short
period
1. Motor protection switch set incorrectly.
⇒ Have the adjustment of the trigger checked and
corrected by a qualified electrician.
2. Increased power consumption due to major voltage
drop.
⇒ Have the voltage of individual phases checked by a
qualified electrician. Contact the electricity distri-
bution network.
3. There are only two phases at the connection.
⇒ Have the connection checked and corrected by a
qualified electrician.
4. Excessive differences in voltage between the phases.
⇒ Have the voltage of individual phases checked by a
qualified electrician. Contact the electricity distri-
bution network.
5. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified elec-
trician.
6. Increased power consumption through jammed hydraul-
ics.
⇒ Clean the hydraulics and check the inlet.
7. The density of the fluid is too high.
⇒ Contact customer service.
26
Faults, causes and remedies
Fault: Pump runs, there is no volume flow
1. There is no fluid.
⇒ Check the inlet, open all gate valves.
2. Inlet clogged.
⇒ Check the inlet and remove clogging.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Pipe system on the pressure side or pressure hose
clogged.
⇒ Remove clogging and replace the damaged com-
ponents if necessary.
5. Intermittent operation.
⇒ Check the switching system.
Fault: Pump starts, duty point is not reached
1. Inlet clogged.
⇒ Check the inlet and remove clogging.
2. Slide valves on the pressure side closed.
⇒ Open all gate valves completely.
3. Hydraulics jammed.
⇒ Clean the hydraulics.
4. Incorrect direction of rotation.
⇒ Have the connection corrected by a qualified elec-
trician.
5. Air cushion in the pipe system.
⇒ Vent the pipe system.
⇒ If air cushions occur frequently: Locate and prevent
the air intake, if required install ventilation systems
at specified locations.
6. Pump pumping against excessive pressure.
⇒ Open all gate valves on the pressure side com-
pletely.
⇒ Check the impeller shape, use other impeller shapes
if required. Contact customer service.
7. Signs of wear on the hydraulics.
⇒ Have the components (impeller, suction port, pump
housing) checked and replaced by customer ser-
vice.
8. Pipe system on the pressure side or pressure hose
clogged.
⇒ Remove clogging and replace the damaged com-
ponents if necessary.
9. Strongly gassing fluid.
⇒ Contact customer service.
10.There are only two phases at the connection.
WILO SE 2019-02
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