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10.1
Mechanical faults
Fault
Pump does not start or stops working Pump blocked
Pump is running at reduced output
Pump is making noise
44
Cause
Incorrectly installed mechanical seal
Cable terminal loose
Fuses faulty
Motor damaged
Motor protection switch has trig-
gered
Motor protection switch set incor-
rectly
Motor protection switch affected by
excessive ambient temperature
PTC thermistor tripping unit has trig-
gered
Incorrect direction of rotation
Stop valve on pressure side throttled Slowly open the stop valve
Speed too slow
Air in the suction line
Cavitation due to insufficient supply
pressure
Incorrectly installed mechanical seal
Motor has bearing damage
Impeller grinding
Remedy
Disconnect motor from power supply,
remove cause of blockage; if motor
blocked, overhaul/replace motor/plugs
Remove the mechanical seal; replace
defective parts; install mechanical seal in
accordance to the instructions
Check/tighten all terminal screws
Check fuses; replace defective fuses
Contact customer service
Throttle the pump to the rated volume
flow on the pressure side
Set the motor protection switch to the
correct nominal current as shown on the
rating plate.
Move the motor protection switch or pro-
tect it using heat insulation
Check the motor and fan cover for con-
taminants and clean if necessary, check
ambient temperature and ensure an
ambient temperature of ≤ 40°C by forced
venting if necessary
Check direction of rotation, change if
necessary
Remedy incorrect terminal bridging
(Y instead of Δ)
Seal leaks at the flanges; bleed pump
Increase supply pressure, observe mini-
mum pressure at the suction port, check
slide valve and filter on the suction side
and clean if necessary
Remove the mechanical seal; replace
defective parts; install mechanical seal in
accordance to the instructions
Have the pump checked by Wilo cus-
tomer service or a specialised service
centre and serviced if necessary
Check faces and centrings and between
lanterns and motor and lantern and pump
housing; clean if necessary.
Check the coupling and shaft sliding sur-
faces. If necessary, clean and lightly oil
them.
WILO SE 11/2013
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