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The pressure of the system does not exceed the set
value of the MP (MMW/MTW) or (MMA, MTA) pa-
rameter. After the delay dL (MMW, MTW) or MP DE-
LAY (MMA, MTA), the pump is stopped and protect-
ed against dry running. The ART function is activat-
ed. See
Special functions
Troubleshooting:
• No water on the intake side of the pump: check
the level or pressure of the water.
• Pump not primed. Prime the pump.
• The pipe on the delivery side of the pump is bro-
ken. The flow of water is too high.
• The pump (impeller or diffuser) is damaged. Con-
tact the technical assistance service.
• The motor is damaged and must be replaced.
N°
Text on
Model
the dis-
14
play (
)
A5
FAULT
MMW
SENS
MTW
MMA
MTA
Troubleshooting: The pressure sensor is faulty.
• For the models MMW and MTW, the sensor is in-
ternal. Contact the assistance service.
• For the models MMA and MTA, the sensor is ex-
ternal and the alarm is triggered with a < 3.2 mA
or > 22 mA signal.
• Check that the sensor and connector are con-
nected.
• Open the cover and check that the power cord of
the sensor is connected and secured to the ter-
minals. See
Figure 15
• Check the cable of the sensor is connected cor-
rectly. See
Figure 15
• The power cable of the sensor has deteriorated:
replace the cable.
• Replace the faulty sensor.
N°
Text on
Model
the dis-
14
play (
)
A6
OVER
MMW
TEMP
MTW
MMA
MTA
Troubleshooting:
• Models MMW and MTW: the temperature of the
power module has reached the value of 80°C. In
AUTOMATIC mode, the converter stops the
pump and does not restart it until the tempera-
ture falls below 60°C.
• Models MMA and MTA: The cooling fan turns on
at 60°C and turns off at 50°C (both MMA12 and
MTA10 have a fan). If the temperature reaches
85°C, the output frequency of the motor is auto-
on page 39.
Descrip-
Reset
tion
Fault
Automat-
with the
ic
pressure
sensor
on page 277.
on page 277.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic.
that the
power
module
of the
converter
has su-
perheat-
ed
matically reduced by 3Hz down to 75°C. At 95°C,
and in AUTOMATIC mode, the converter stops
the pump and does not restart it until the temper-
ature falls below 80°C.
• Models MMW and MTW:
– The temperature of the water exceeds the
limits for use of the converter. See
data
on page 27.
• The power module is faulty: contact the assis-
tance service.
• The ambient temperature exceeds the limits for
use of the converter. See
27.
• Models MMA12 and MTA10:
– The cooling fan is faulty. Contact the assis-
tance service.
• The cooling fan does not work.
– Open the cover and check the power cable of
the fan is connected and secured to the rela-
tive terminals. See
N°
Text on
Model
the dis-
14
play (
)
A7
SHORT
MMW
CIRC
MTW
MMA
MTA
An automatic function of the converter that detects
current consumption while the motor is running. The
converter cuts out the power supply to the motor and
remains locked.
Troubleshooting:
• The motor is damaged and must be replaced.
• The power cable of the motor is faulty or worn:
replace the cable.
N°
Text on
Model
the dis-
14
play (
)
A8
OVER
MMW
VOLT
MTW
MMA
MTA
An automatic function of the converter that detects
the voltage value of the power line. The converter
en - Original instructions
Technical
Technical data
on page
Figure 15
on page 277.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic. A max
a short
of 4 at-
circuit on
tempts to
the pow-
start are
er supply
made at
side of
2 second
the mo-
intervals.
tor
The
pump is
perma-
nently
locked if
the alarm
perse-
veres af-
ter the
reset
tests.
Descrip-
Reset
tion
Alarm in-
Automat-
dicating
ic
the volt-
age sup-
ply of the
converter
is high
41
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