Faults, Causes And Remedies - Wilo CronoLine-IL Notice De Montage Et De Mise En Service

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Faults, causes and remedies

Fault
Pump does not start or stops working Pump blocked
Pump runs at reduced
Power
Pump making noises
Table 6: Faults, causes and remedies
Installation and operating instructions Wilo-CronoLine-IL/CronoBloc-BL (with cartridge mechanical seal)
Have faults remedied by qualified personnel only! Observe the
safety instructions in chapter 9 "Maintenance" on page 49.
• If the malfunction cannot be rectified, consult a specialist techni-
cian or the nearest customer service centre or representative
office.
Cause
Incorrectly installed mechanical seal
Cable terminal loose
Fuses defective
Motor damaged
Motor protection switch has
triggered
Motor protection switch set
incorrectly
Motor protection switch affected by
excessive ambient temperature
PTC thermistor tripping unit has
triggered
Incorrect direction of rotation
Stop valve on the pressure side
throttled
Speed too slow
Air in the inlet pipe
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/motor
impeller unit
Remove the mechanical seal; replace
defective parts; install mechanical seal
in accordance to the instructions
Check all cable connections
Check fuses; replace faulty fuses
Have the motor checked by Wilo cus-
tomer service or a specialised service
centre and serviced if necessary
Throttle the pump to the rated volume
flow on the pressure side
Set the motor protection switch to the
correct rated current as shown on the
rating plate
Move the motor protection switch or
protect 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
Slowly open the stop valve
Remedy incorrect terminal bridging
(Y instead of Δ)
Repair leaks on flanges, vent the pump,
change the mechanical seal in case of
visible leakage
Increase supply pressure, observe mini-
mum pressure at the suction port, check
slide valve and filter on the suction side
and clean if need be
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 repaired 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
surfaces. If necessary, clean and lightly
oil them.
English
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