English
36
WILO SE 05/2017
10 Faults, causes and remedies
For faults, causes and remedies see tables 10 and 10.1.
Have faults remedied by qualified personnel only! Follow the safety instructions in
chapter 9!
Table 10: Faults with external interference sources
Faults
Causes
Remedy
Pump is not running
although the current entry is
switched on.
Electrical fuse defective.
Check fuses.
Pump has no voltage.
Reconnect the voltage.
Pump is noisy.
Cavitation due to insufficient
suction pressure.
Increase the system suction pressure
within the permissible range.
Check the delivery head and set it to
a lower height if necessary.
Faults
Causes
Performance of the
pump/remedy
Description
Mains
undervoltage
Mains overloaded
Switch off and
restart the motor.
In the event of overvoltage or
undervoltage, the motor is
switched off. It starts automati-
cally when the voltage is within
the valid range once again. SSM
relay is active.
Mains
overvoltage
Faulty supply by the
energy provider
Switch off and
restart the motor.
Motor blocking
e.g. due to deposits
Motor restarts after
a delay. After
5 unsuccessful
starts the motor is
switched off perma-
nently.
If the motor is blocked, a maxi-
mum of 5 restarts are initiated at
30 second intervals. If the motor
is still blocked, it is switched off
permanently. This can only hap-
pen if the power is disconnected
for longer than 30 seconds and
then switched on again. The
unblocking programme runs dur-
ing every start-up procedure. The
SSM relay is active as long as the
internal error counter is not ZERO.
Synchronous
run defective
High level of friction,
motor control not
okay
If the motor's rotat-
ing field is not syn-
chronised, the pump
tries to restart every
5 seconds.
In the event of a defective syn-
chronous run the motor is shut
off. A restart is initiated after
5 seconds. The pump starts auto-
matically once the rotating field is
synchronised.
Motor overload
Deposits in the
pump
The motor stops
when overload has
been detected and
restarts after a delay.
When the motor's power limit has
been reached, the motor stops.
A restart is initiated after
30 seconds. The pump starts
automatically when the motor's
power is below the limit.
