24
English
WILO SE 08/2017
8. Faults, Causes and Remedies
A blockage of the pump can in most cases be
remedied by removing the suction connection and
scouring the pump backwards under pressure.
Switch-on pump several times for 2 secs during
scouring.
If the fault cannot be located or rectied, please
contact your nearest WILO representative.
Faults Causes Remedies
Pump does not run Interruption of the current, short circuit,
Insulation fault in the motor coil
Check power supply, Call on expert to
check cable and motor
Pump is blocked due to foreign matters
(1)
– Switch off the pump voltage and
secure against reoperation.
– Close the shut-off ttings at the back
and front of the pump.
– Remove foreign bodies from the pump
Protective motor switch activated
(1 ~ -Motor)
Let the pump/motor cooling
Motor overheats Too low voltage Check voltage on terminals of the motor.
It should be within ± 6 % (50 Hz), resp. ±
6 % (60 Hz) of the rated voltage
Pump is blocked due to foreign matters (see 1)
Ambient temperature above +40 °C The motor is aimed at operating at
a maximum ambient temperature
of +40 °C
Altitude > 1000 m Motor is planned to operate at an alti-
tude ≤ 1000 m
Thermal relay Value of the thermal relay (3 ~ -Motor)
is too low
Check the current with an ammeter or put
the value switches off of the cuttent rating
mentioned on the motor data plate
Voltage is too low Check the adequate cross-section of the
electrical cable conductors
A phase is cut Check it and change the electrical cable if
necessary
Thermal relay of the curcuit-breaker is
defective
replace it
Motor is defective replace it
Pump runs, but no delivery or it
tranports too little
Pump is blocked due to foreign matters (see 1)
Pump is empty Fill the pump
Air in suction pipes Check tightness of the whole pipe up to
the pump and make it tight
Suction pie obstructed Clean all the pipes
Wrong rotating direction(3 ~ -Motor) Cross two phase wires
Pump vibrates Loose on ist foundation Check and completely tighten the nuts
of the stud bolts
Pump is blocked due to foreign matters (see 1)
Bad electrical connection Check the connections to the pump
motor
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