Faults, Causes And Remedies - Wilo Star STG Einbau- Und Betriebsanleitung

10 Faults, causes and remedies

Only have faults remedied by qualified personnel.
Observe the safety instructions in chapter 9!
Faults
Pump is not run-
ning although the
power supply is
switched on.
Pump is making
noises.
If the fault cannot be remedied, please consult the specialist
technician or the Wilo factory after-sales service.
Installation and operating instructions Wilo-Star STG
Causes
Electrical fuse
defective.
Pump has no
voltage.
Condenser
defective
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)
Restore power after interrup-
tion
Check condenser
(Observe rating plate)
Replace 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 check
valves upstream and down-
stream to the pump at high
water temperatures and sys-
tem pressures. Allow the pump
to cool down beforehand.
Increase the system suction
pressure within the permissi-
ble range.
Check the speed setting and
switch to a lower speed as
necessary.
German
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