en Faults, causes and remedies
24 WILO SE 2019-02
DANGER
Risk of fatal injury due to dangerous lone
working practices!
Work in chambers and narrow rooms as well as work
involving risk of falling are dangerous work. Such
work may not be carried out autonomously! A second
person must be present for safety reasons.
WARNING
No persons are allowed to be present inside
the working area of the pump!
Persons may suffer (serious) injuries while the pump
is in operation! No persons may therefore be present
inside the working area. If persons must enter the
working area of the pump, the pump must be de-
commissioned and secured against being switched
on again without authorisation.
WARNING
Sharp edges on the impeller and suction port!
Sharp edges can form on the impeller and suction
port. There is danger of limbs being severed! Pro-
tective gloves must be worn to protect from cuts.
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 equipment
⇒ Have the connection and the monitoring equip-
ment 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 equipment.
⇒ Check the impeller to make sure that it runs
smoothly, clean the hydraulics if necessary.
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.
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.
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