Wilo Comfort-Vario COR-1***-/VR Series, Installation And Operating Instructions Manual, Page: 37 / 44

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Installation and operating instructions Wilo-SiBoost Smart 1, Wilo-Comfort-Vario COR-1 ...-GE, .../VR 45
Nominal diameter of the inlet pipe too
small Check the inlet pipe and increase the cross-
section of the inlet pipe if necessary.
Inlet pipe installed incorrectly Check the inlet pipe and change the pipe
routing if necessary.
Air in the inlet Check and shut off the piping and vent the
pumps if necessary.
Air in the pump Vent the pump, check the suction line for
leakages and seal it if necessary.
Impellers blocked Check the pump and replace it or have it
repaired if necessary.
Flow rate too high Check the pump data and default values
and correct them if necessary.
Incorrect direction of rotation of the
motors Check the direction of rotation and repair or
replace the frequency converter module if
necessary.
Mains voltage: a phase is missing Check the fuses, cables and connections.
Pump not adequately secured to base
frame Check the fixation and re-tighten the fas-
tening screws if necessary.
Bearing damage Check the pump/motor and replace it or
have it repaired if necessary.
Motor or pump become too warm Air in the inlet Check and shut off the piping and vent the
pumps if necessary.
Gate valve in the system closed or not
sufficiently open Check and open the shut-off device com-
pletely if necessary.
Impellers blocked Check the pump and replace it or have it
repaired if necessary.
Non-return valve blocked Check and remove the blockage or replace
the non-return valve if necessary.
Shut-off device closed at pressure sensor Check and open the shut-off device if nec-
essary.
Switch-off point set too high Check the setting and correct it if neces-
sary.
Bearing damage Check the pump/motor and replace it or
have it repaired if necessary.
Turn-to-turn fault in the motor Check, if necessary replace motor or have
repaired.
Mains voltage: a phase is missing Check the fuses, cables and connections.
Current consumption too high Non-return valve leaking Check and replace the seal or non-return
valve if necessary.
Flow rate too high Check the pump data and default values
and correct them if necessary.
Turn-to-turn fault in the motor Check, if necessary replace motor or have
repaired.
Mains voltage: a phase is missing Check the fuses, cables and connections.
Motor protection switch triggers Non-return valve defective Check and replace the non-return valve if
necessary.
Flow rate too high Check the pump data and default values
and correct them if necessary.
Contactor defective Check it and replace it if necessary.
Turn-to-turn fault in the motor Check, if necessary replace motor or have
repaired.
Mains voltage: a phase is missing Check the fuses, cables and connections.
Pump generates no or insufficient
power Major fluctuations of the inlet pressure Check the inlet pressure and take measures
to stabilise the inlet pressure if necessary
(e.g. pressure reducers).
Intake pipe blocked or shut off Check the inlet pipe and remove the block-
age or open the shut-off device if neces-
sary.
Nominal diameter of the inlet pipe too
small Check the inlet pipe and increase the cross-
section of the inlet pipe if necessary.
Inlet pipe installed incorrectly Check the inlet pipe and change the pipe
routing if necessary.
Fault Cause Remedy