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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!
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.
36
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 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.
Increase the system suction pres-
sure within the permissible range.
Check the speed setting and
switch to a lower speed as
necessary.
WILO SE 08/2019
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