Wilo Star-Z - Faults, Causes, and Remedies

English
36 WILO SE 08/2019
After successful maintenance and repair work, install and con-
nect the pump according to the “Installation and electrical con-
nection” chapter. Switch on the pump according to the
“Commissioning” chapter.
10 Faults, causes and remedies
Have faults remedied by qualified personnel only!
Observe the safety instructions in chapter 9!
If the operating fault cannot be remedied, please consult a
specialist technician or the Wilo factory after-sales service.
Fault Cause Remedy
Pump is not run-
ning although
the current
entry is
switched on.
Electrical fuse
defective.
Check fuses
Pump has no volt-
age.
Check the voltage on the pump
(Observe the rating plate)
Reconnect the voltage.
Condenser defec-
tive.
Check the condenser
(Observe the rating plate)
Exchange the condenser.
Motor is blocked,
e.g. due to
deposits.
Unscrew the venting screw com -
pletely and check the ease of
movement of the pump rotor or
make it easy to move by turning
the slotted end of the shaft with a
screwdriver (fig. 8).
ATTENTION! Close the shut-off
devices upstream and down
-
stream of the pump at high water
temperatures and system pres -
sures.
Allow the pump to cool down first.
Pump is noisy. Cavitation due to
insufficient suction
pressure.
Increase the system suction pres -
sure within the permissible range.
Check the speed setting and
switch to a lower speed as
necessary.