en
52
Faults
Causes
•
Impeller damaged and
corroded
Insufficient volume
•
Seal ring damaged and
flow
corroded
•
Motor speed is lower than
required
•
Incorrect direction of ro-
tation
•
Min. inlet pressure too low
Delivery head losses
or negative suction head
too high
•
Impeller damaged and
corroded
•
Volume flow is outside
the permissible field of
application
•
Voltage higher than rated
Motor overheating
voltage
•
Voltage too low, fan
works too slowly
•
Motor fan damaged
•
Housing screws not
Leakage at the pump
tightened
Noise, bearings become
•
Motor bearings damaged
hot
•
The pump is strained
•
Volume flow rate is out-
side the permissible field
Pump makes noises
of application and causes
the delivery head loss
•
Power supply failure
•
Fuses have tripped or
blown
•
Motor protection switch
Pump does not start
has been triggered
•
Thermal protection has
tripped out
•
Motor is malfunctioning
•
A fuse/circuit breaker has
tripped or blown
Motor overload trips
•
Cable connection is loose
out immediately when
or faulty
power supply is activ-
•
Motor winding is defect-
ated
ive
•
Pump mechanically
clogged
•
Overload setting is too
Motor overload trips
low
out occasionally
•
Low voltage at peak times
•
Pump inlet pressure is too
low (cavitation)
Pump capacity not
•
Suction pipe/pump partly
constant
clogged by impurities
•
Pump draws in air
Installation and operating instructions • Wilo-Atmos BST • Ed.01/2023-07
Remedy
•
Replace impeller
•
Replace gasket
•
Check voltage
•
Change motor wiring (3 phase
motor: swap phases)
•
Correct liquid level, reduce
resistances in the suction line
•
Replace impeller
•
Adhere to recommended
minimum volume flow
•
Check voltage
•
Check voltage
•
Check motor fan
•
Tighten the housing screws
•
Have bearings replaced
•
Correct the pump installation
•
Adhere to recommended
minimum volume flow
•
Check power supply
•
Replace fuses
•
Reactivate the motor protec-
tion
•
Reactivate the thermal pro-
tection
•
Replace motor (contact ser-
vice)
•
Cut in the fuse
•
Fasten or replace the cable
connection
•
Replace motor (contact ser-
vice)
•
Remove clogging
•
Set motor protection switch
correctly
•
Check power supply
•
Check the suction conditions
•
Clean pump and supply line
•
Check the suction conditions