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Faults
Causes
Pump blocked.
Incorrectly installed mechan-
ical seal.
Cable terminal loose.
Fuse protection defect.
Motor damaged.
Pump does not start or
stops working.
Motor protection switch has
triggered.
Motor protection switch set
incorrectly
Motor protection switch af-
fected by excessive ambient
temperature
PTC thermistor tripping unit
has triggered.
Incorrect direction of rota-
tion.
Stop valve on the pressure
side throttled.
Pump runs at reduced
Speed too slow
performance.
Air in the suction line
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
Remedies
Electrically isolate the motor.
Remove the cause of the block-
ing. Motor blocking: Overhaul/
replace motor/motor impeller
unit.
Remove the mechanical seal; re-
place defective parts; install
mechanical seal in accordance to
the instructions.
Check all cable connections.
Check fuses; replace faulty
fuses.
Have the motor checked by the
Wilo customer service or a spe-
cialised service centre and re-
paired if necessary.
Set the pump to the rated
volume flow on the discharge
side (see rating plate).
Set the motor protection switch
to the correct rated current (see
rating plate).
Move the motor protection
switch or protect it using heat
insulation.
Check the motor and fan cover
for contamination and clean
them if necessary.
Check the ambient temperature
and, if necessary, set the ambi-
ent temperature to ≤ 40 °C by
forced ventilation.
Check the direction of rotation
and change it if necessary.
Slowly open the stop valve.
Incorrect terminal bridging (Y in-
stead of Δ).
Eliminate leakage at flanges.
Vent pump. In case of visible
leakage, replace the mechanical
seal.
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