English
32
WILO SE 11/2013
10
Faults, causes and remedies
Have faults remedied by qualified personnel only! Observe the
safety instructions in chapter 9 “Maintenance” on page 29.
• If the malfunction cannot be rectified, consult a specialist techni-
cian or the nearest Wilo customer service or representative office.
11
Spare parts
Spare parts may be ordered via a local specialist and/or Wilo after-
sales service.
To avoid queries and incorrect orders, all data of the rating plate
should be submitted for each order.
CAUTION! Risk of material damage!
Trouble-free pump operation can only be guaranteed when origi-
nal spare parts are used.
• Only use original Wilo spare parts.
• Information to be provided when ordering spare parts:
• Spare part number
• Name/description of the spare part
• All data on the pump and motor rating plate
Fault
Cause
Remedy
Pump does not start
or stops working
Pump blocked
Disconnect motor from power supply, remove cause of
blockage; if motor blocked, overhaul/replace motor/plugs
Cable terminal loose
Tighten all terminal screws
Fuses defective
Check fuses; replace faulty fuses
Motor damaged
Have the motor checked by Wilo customer service or a spe-
cialised service centre and serviced if necessary
Motor protection switch has
triggered
Throttle the pump to the rated volume flow on the pressure
side
Motor protection switch set
incorrectly
Set the motor protection switch to the correct rated current
as shown on the rating plate.
Motor protection switch
affected by excessive ambient
temperature
Move the motor protection switch or protect it using thermal
insulation
PTC thermistor tripping unit
has triggered
Check the motor and fan cover for contaminants and clean if
necessary, check ambient temperature and ensure an ambi-
ent temperature of
≤
40°C by forced venting if necessary
Pump runs at reduced
output
Incorrect direction of rotation
Check direction of rotation, change if necessary
Stop valve on the pressure side
throttled
Slowly open the stop valve
Air in the suction line
Seal leaks in at the flanges; vent
Pump making noises
Insufficient supply pressure
Increase supply pressure, observe minimum pressure at the
suction port, check slide valve and filter on the suction side
and clean if need be
Motor has bearing damage
Have the pump checked by Wilo after-sales service or a spe-
cialised service centre and repaired if necessary
Summary of Contents for VeroLine-IPS 20
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