Wilo Wilo-CronoBloc-BL, Installation And Operating Instructions Manual

Page: 23 / 30

English
38 WILO SE 11/2013
10 Faults, causes and remedies
Only have faults remedied by qualified personnel! Observe the
safety instructions in chapter 9 “Maintenance” on page 34.
• If the malfunction cannot be rectified, consult a specialist techni-
cian or the nearest customer service or representative office.
11 Spare parts
Spare parts may be ordered via a local specialist retailer and/or Wilo-
customer service.
To avoid queries and incorrect orders, all data on the rating plate
should be submitted for each order.
CAUTION! Risk of damage!
Trouble-free pump operation can only be guaranteed when origi-
nal spare parts are used.
• Only use original Wilo spare parts.
• Each component is identified in the table below.
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
NOTE
For all installation work, the forked spacer is required for setting the
correct impeller position in the pump housing.
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 Check all cable connections
Fuses faulty Check fuses; replace defective 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 nominal cur-
rent as shown on the rating plate.
Motor protection switch
affected by excessive ambient
temperature Move the motor protection switch or protect it using heat
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 is running at
reduced output Incorrect direction of rotation Check direction of rotation, change if necessary
Stop valve on pressure side
throttled Slowly open the stop valve
Speed too slow Remedy incorrect terminal bridging (Y instead of Δ )
Air in the suction line Seal leaks at the flanges; bleed
Pump is making noise 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 necessary
Motor has bearing damage Have the pump checked by Wilo customer service or a spe-
cialised service centre and serviced if necessary
Impeller grinding Check faces and centrings and between lanterns and motor
and lantern and pump housing, clean if necessary.
Check the coupling and shaft sliding surfaces. If necessary,
clean and lightly oil them.