Wilo Atmos GIGA-N Mode D'emploi page 75

Installation and operating instructions Wilo-Atmos GIGA-N
Faults, causes and remedies
Error type:
1 2 3 4 5 6 7
X
X
X
X
X
X
X
X
X
X X
X
X X X X
X X
X X X
X
X
X
X X
X
X
X
X X
X
X
Table 11: Causes of error and remedies
8 Cause
Incorrect direction of
rotation
Pump sucks air or the
suction line is leaky
Supply line or impeller
clogged
Pump blocked by loose
or jammed parts
Air pockets in the piping – Change the pipe lay-
Speed too low
– with frequency con-
verter operation
– without frequency
converter operation
Motor running on
2 phases
Counter pressure of the
pump too low
The viscosity or density
of the fluid is higher
than the design value
X The pump is strained
Speed too high
Pump unit poorly
aligned
Thrust too high
Bearing lubrication not
sufficient
Coupling distance not
maintained
X – Flow rate too low
– Housing screws not
correctly tightened or
gasket defective
Leak in mechanical seal
Shaft sleeve (if present)
worn
Imbalance of the im-
peller
Bearing damage
Foreign object in the
pump
X Pump pumps against
closed shut-off device
en
Remedy
– Change the motor
connection phases
– Replace gasket
– Check suction line
– Remove clog
– Clean pump
out or install an air vent
valve
– Increase frequency in
the permissible range
– Check voltage
– Check phases and
fuses
– Readjust the duty
point or adjust the im-
peller
– Check the pump di-
mensioning (consult
with the manufacturer)
Correct the pump in-
stallation
Lower speed
– Correct alignment
– Clean the relief bores
in the impeller
– Check the condition
of the neck rings
Check bearing, ex-
change bearing
– Correct the coupling
distance
– Maintain recommen-
ded minimum flow rate
– Check tightening
torque
– Replace gasket
– Replace the mechan-
ical seal
– Replace the shaft
sleeve
– Rebalance the im-
peller
– Exchange bearing
– Clean pump
– Open the shut-off
device in the pressure
pipe
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