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10 Faults, causes and remedies
Have faults remedied by qualified personnel only!
Observe the safety instructions in chapter 9!
Fault
Pump is not run-
ning although the
current entry is
switched on.
Pump is noisy.
If the operating fault cannot be remedied, please consult a
specialist technician or the Wilo factory after-sales service.
Installation and operating instructions Wilo-Star-Z/-ZD
Cause
Electrical fuse
defective.
Pump has no volt-
age.
Condenser defec-
tive.
Motor is blocked,
e.g. due to
deposits.
Cavitation due to
insufficient suction
pressure.
Remedy
Check fuses
Check the voltage on the pump
(Observe the rating plate)
Reconnect the voltage.
Check the condenser
(Observe the rating plate)
Exchange the condenser.
Unscrew the venting screw
completely 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. 9).
ATTENTION! Close the shut-off
devices upstream and down-
stream of the pump at high
water temperatures and system
pressures.
Allow the pump to cool down
first.
Increase the system suction
pressure within the permissible
range.
Check the speed setting and
switch to a lower speed as
necessary.
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