en
Faults, causes and remedies
246
WILO SE 2021-12
In the event of faults, fault management only provides feasible pump outputs and
functionalities.
Any occurred faults are permanently checked and, if mechanically possible, emergency
operation or control mode are activated.
Flawless pump operation is only resumed once the fault cause no longer applies. Ex-
ample: The electronic module is again cooled down.
Configuration warnings indicate that an incomplete or wrong configuration is prevent-
ing execution of a desired function.
NOTICE
If the pump behaves incorrectly, check that the analogue and digital inputs are con-
figured correctly.
For details, see the detailed instructions at www.wilo.com
If the malfunction cannot be rectified, consult a specialist technician or the nearest
Wilo customer service or representative location.
18.1
Mechanical faults without error
messages
Faults
Causes
Remedy
Pump does not start or
stops working.
Cable terminal loose.
Fuse protection defect.
Pump does not start or
stops working.
Fuse protection defect.
Check fuses; replace faulty
fuses.
Pump runs at reduced
performance.
Stop valve on the pressure
side throttled.
Slowly open the stop valve.
Pump runs at reduced
performance.
Air in the suction line.
Eliminate leakage at flanges.
Vent pump. In case of visible
leakage, replace the mechan-
ical seal.
Pump makes noises.
Cavitation due to insuffi-
cient suction pressure.
Increase the suction pressure.
Observe the minimum inlet
pressure at the suction port.
Check slide valve and filter on
the suction side and clean if
need be.
Pump makes noises.
Motor has bearing damage.
Have the pump checked by
Wilo customer service or a spe-
cialised service centre and re-
paired if necessary.
Table 53:
Mechanical faults
18.2
Diagnostics help
In order to support fault analysis, the pump provides additional help apart from fault
notifications:
Diagnostics help is used for diagnosis and maintenance of electronics and interfaces.
Apart from hydraulic and electrical overviews, information about interfaces, device in-
formation and manufacturer’s contact data are provided.
In the “Diagnostics and measured values” menu
, select
1.
“Diagnostics help”.
Selection options:
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