Installation and operating instructions Wilo-Star STG 31
German
10 Faults, causes and remedies
Only have faults remedied by qualified personnel.
Observe the safety instructions in chapter 9!
If the fault cannot be remedied, please consult the specialist
technician or the Wilo factory after-sales service.
Faults Causes Remedy
Pump is not run-
ning although the
power supply is
switched on.
Electrical fuse
defective.
Check fuses.
Pump has no
voltage.
Check the voltage on the
pump.
(Observe the rating plate)
Restore power after interrup-
tion
Condenser
defective
Check condenser
(Observe rating plate)
Replace condenser
Motor is blocked,
e.g. due to deposits
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.
Pump is making
noises.
Cavitation due to
insufficient suction
pressure.
Increase the system suction
pressure within the permissi-
ble range.
Check the speed setting and
switch to a lower speed as
necessary.
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