20
Wilo-WiBooster - Installation and Operation Manual
FAULT
CAUSE
REMEDIES
Switching frequency too high or
fluttering
Intake pressure fluctuates severely
Check intake pressure, if necessary take measures to stabilise supply pressure
(e.g. pressure reducer)
Intake pipe blocked or shut off
Check inlet pipe, if necessary remove blockage or open check valve
Nominal diameter of inlet pipe too
small
Check the inlet pipe, increase the crosssection for the inlet pipe if necessary
Inlet pipe incorrectly installed
Check inlet pipe, if necessary change pipe guide
Check valve closed at pressure
sensor
Inspect, open check valve if necessary
No diaphragm pressure vessel
present (optional or accessory)
Retrofit a diaphragm pressure vessel
Supply pressure at existing
diaphragm pressure vessel incorrect
Check supply pressure and correct if necessary
Valve on existing diaphragm pressure
vessel closed
Check valve and open if necessary
Existing diaphragm pressure vessel
defective
Check the diaphragm pressure vessel and replace if necessary
Set switching difference too small
Check setting and correct if necessary
Pump(s) produces no or too little
pressure
Major fluctuations in Intake pressure
Check intake pressure, if necessary take measures to stabilise supply pressure
(e.g. pressure reducer)
Intake pipe blocked or shut off
Check inlet pipe, if necessary remove blockage or open check valve
Nominal diameter of inlet pipe too
small
Check the inlet pipe, increase the crosssection for the inlet pipe if necessary
Inlet pipe incorrectly installed
Check inlet pipe, if necessary change pipe routing
Air in inlet
Check, if necessary seal pipe. Vent pumps
Impellers blocked
Check pump, if necessary replace or have repaired
Non-return valve leaking
Check, if necessary replace seal or replace non-return valve
Non-return valve blocked
Check, if necessary remove blockage or replace non-return valve
Gate valve in system closed or not
sufficiently open
Check, open the check valve completely if necessary
Low-water level switch has triggered Check intake pressure
Direction of motor rotation false
Check direction of rotation and correct by changing over phases if necessary
Turn-to-turn fault in motor
Check, if necessary replace motor or have repaired
Dry-running protection system
switches off, although water is
present
Major fluctuations in Intake pressure
Check intake pressure, if necessary take measures to stabilise supply pressure
(e.g. pressure reducer)
Nominal diameter of inlet pipe too
small
Check the inlet pipe, increase the crosssection for the inlet pipe if necessary
Inlet pipe incorrectly installed
Check inlet pipe, if necessary change pipe guide
Volume flow too large
Check pump data and default values and correct if necessary
Electrodes incorrectly connected or
supply pressure switch incorrectly
set
Check installation or setting and correct
Low-water level switch defective
Check, if necessary replace the lowwater level switch
Dry-running protection does not
switch off, although water low
Electrodes incorrectly connected or
supply pressure switch incorrectly
set
Check installation or setting and correct
Low-water level switch defective
Check, if necessary replace the lowwater level switch
