Faults, Causes And Remedies - Wilo SiBoost Smart Série Notice De Montage Et De Mise En Service

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10 Faults, causes and remedies

Faults, particularly those affecting the pumps or
the control system, should only be remedied by
Wilo's customer service or a specialist company.
Fault
Display on the control device or
frequency converter incorrect
Pump(s) do(es) not start
Pump(s) do not switch off
Pump(s) do not switch off
22
Cause
No mains voltage
Main switch "OFF"
Water level in break tank too low,
i.e. low-water level reached
Low water level indicated
Low water cut-out switch or pressure
sensor on the intake side is faulty
Electrodes connected incorrectly or
pressure for low water cut-out switch
set incorrectly
Inlet pressure is above start-up
pressure
Shut-off device closed at pressure
sensor
Start-up pressure set too high
Fuse defective
Motor protection has triggered
Contactor defective
Turn-to-turn fault in the motor
Major fluctuations of the inlet pressure Check the inlet pressure and take measures
Inlet pipe blocked or shut off
Nominal diameter of the inlet pipe too
small
Inlet pipe installed incorrectly
Air in the inlet
Impellers blocked
Non-return valve leaking
Non-return valve blocked
Gate valve in the system closed or not
sufficiently open
Flow rate too high
Shut-off device closed at pressure
sensor
Switch-off pressure set too high
Incorrect direction of rotation of the
motors
NOTICE!
The general safety instructions must be observed
during any maintenance or repair work. Also fol-
low the installation and operating instructions of
the pumps and the control device.
Remedy
Make use of the information from the
installation and operating instructions for
the pump or the control device
Check the fuses, cables and connections
Switch on the main switch
Check the break tank's inlet valve /
supply line
Check the inlet pressure or the level in the
break tank
Check and replace the low water switch or
pressure sensor as necessary
Check the installation or setting and
correct it
Check the default values and correct them if
necessary
Check and open the shut-off device if
necessary
Check the setting and correct it if necessary
Check fuses and replace if necessary
Check default values against the pump or
motor data, measure current values and
correct setting if necessary. Check motor for
defects and replace if necessary
Check it and replace it if necessary
Check, if necessary replace motor or have it
repaired
to stabilise the inlet pressure if necessary
(e.g. pressure reducers)
Check the inlet pipe and remove the
blockage or open the shut-off device if
necessary
Check the inlet pipe and increase the cross-
section of the inlet pipe if necessary
Check the inlet pipe and change the pipe
routing if necessary
Check and shut off the piping and vent the
pumps if necessary
Check the pump and replace it or have it
repaired if necessary
Check and replace the seal or non-return
valve if necessary
Check and remove the blockage or replace
the non-return valve if necessary
Check and open the shut-off device
completely if necessary
Check the pump data and default values and
correct if necessary
Check and open the shut-off device if
necessary
Check the setting and correct it if necessary
Check the direction of rotation and correct
by changing over the phases if necessary
WILO SE 08/2018