Wilo FLA Compact-1 Helix V16, Installation And Operating Instructions Manual, Page: 50 / 96

English
36 WILO SE 07/2019
Pump is not stable and/or making
unusual noises Connection pipe between VBH and pump
blocked or shut off Check the connection pipe, if necessary,
remove the clogging or open the shut-off
device
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
Air in the pump due to insufficient level in
the tank Check the level in the tank. If necessary,
readjust the float valve
Air in the pump due to blocked bypass
line Check the bypass line, if necessary, remove
the clogging or open the shut-off device
Impellers are blocked Check the pump and replace it or have it
repaired if necessary
Flow rate is too high Check the pump data and default values and
correct them if necessary
Incorrect direction of rotation of the
motors Check direction of rotation and correct by
changing over phases if necessary
Pump is not stable and/or making
unusual noises Mains voltage: a phase is missing Check the fuses, cables and connections
Pump is not adequately secured to base
frame Check the fixation and re-tighten the
fastening 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, seal the pipeline if necessary, bleed
the pumps, check the level in the tank
Bypass line is closed or not sufficiently
open Check, also check the bypass passage if
necessary
Impellers are blocked Check the pump and replace it or have it
repaired if necessary
Bearing damage Check the pump/motor and replace it or have
it repaired if necessary
Turn-to-turn fault in the motor Check and, if necessary, replace the motor or
have it repaired
Mains voltage: a phase is missing Check the fuses, cables and connections
Current consumption is too high Flow rate is too high Check the pump data and default values and
correct them if necessary
Turn-to-turn fault in the motor Check and, if necessary, replace the motor or
have it repaired
Mains voltage: a phase is missing Check the fuses, cables and connections
Motor protection switch triggers
(fault only occurs in test
operation) Non-return valve is defective Check and replace the non-return valve if
necessary
Flow rate is too high Check the pump data and default values and
correct them if necessary
Power contactor is defective Check it and replace it if necessary
Turn-to-turn fault in the motor Check and, if necessary, replace the motor or
have it repaired
Mains voltage: a phase is missing Check the fuses, cables and connections
Pump generates no or insufficient
power Inlet pipe is blocked or shut off Check the inlet pipe and remove the block-
age or open the shut-off device if necessary
Air in the inlet Check and shut off the piping and vent the
pumps if necessary
Impellers are blocked Check the pump and replace it or have it
repaired if necessary
Non-return valve is leaking Check and replace the seal or non-return
valve if necessary
Non-return valve is blocked Check and remove the blockage or replace
the non-return valve if necessary
Gate valve in the system is closed or not
sufficiently open Check and open the shut-off device
completely if necessary
Pump generates no or insufficient
power Incorrect direction of rotation of the
motors Check direction of rotation and correct by
changing over phases if necessary
Turn-to-turn fault in the motor Check and, if necessary, replace the motor or
have it repaired
Fault Cause Remedy