34
Problem
The pump does
not switch on
Intervention of
the differential
switch to protect
the inverter power
supply line
The pump does
not start
Pump always
functions, even
without request
Pump performan-
ces lower that
those on the plate
Cause
Electric power sup-
ply cut-off
Fuses burned
Intervention of the
line protections
The differential
switch is inadequate
for inverter power
supply
The pump is out of
service (put out of
service manually).
The pump is out of
service due to dry
running anomaly.
Motor breakdown
The pump is blo-
cked
Level signal not pre-
sent with active level
input signal active.
Out of Service using
external signal.
Leaks in the plant
Flow rate sensor
broken or obstructe
Pressure sensor
broken
Presence of air in
the intake manifold
Pump blocked or
damaged
Large pressure drop
downstream from
the unit
Intervention
Restore the electric power
supply
Replace the fuses
Check the correct cali-
bration of the protections,
identifying and removing
the cause
Replace the differential
switch with a model suita-
ble for the buttons and in
direct current (class A)
Push ON + ENTER to
put the pump back into
service
Identify and remove the
cause of the alarm
Remove the pump and
replace the motor
Remove the pump, identify
and eliminate the block
Check for water at the
suction or the level signal
function.
Check the external signal.
Identify the leaks and
block them
Check that the valve
moves freely
Inspect and check the
pressure sensor
Bleed the intake
Inspect the pump and
eliminate the problem
Identify and eliminate the
large pressure drop.
Light off
Light on
Light flashing
POWER
STATUS
POWER
STATUS
POWER
STATUS
P _ X . X
POWER
STATUS
P X . X
POWER
STATUS
P _ X . X
Troubleshooting
Maintenance
POWER
STATUS
OFF
POWER
STATUS
DRY RUNNING
POWER
STATUS
OVER CURRENT
POWER
STATUS
LOW LEVEL
POWER
STATUS
EXT OFF
EN
