Wilo FLA Compact-1 Helix V16 Installation And Operating Instructions Manual page 50

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