- Error code
- Error message
- Signal
Name of Alarm and Cause Solution
- E019
- Ileak sense.fail
-
Alarm LED
Failure of test on sensor to measure the leakage
current (DC side):
Before connecting to the grid the inverter runs a au-
totest regarding the sensor for the leakage current. The
test is carried out by “forcing", in the sensor of the leak-
age current, a current with a known value: the micropro-
cessor compares the value read with the known value.
The error is generated if the comparison between the
read value and the known value during the test does
not fall within the allowed tolerance.
• Error inside the inverter and cannot be checked externally.
By its nature, the alarm only occurs prior to connection to the
grid
- If the problem (once the inverter has been switched off and
back on) persists, contact customer assistance.
- E020
- Self Test Error 1
-
Alarm LED
Failure of the test on the relay of the “Booster”
(DC-DC circuit):
Before connecting to the grid the inverter carries out in-
ternal tests. One of these tests concerns the correct op-
eration of the booster relay. The test is carried out by “forc-
ing” the switching of the relay and checking its operation.
The error is generated if a problem is found in action-
ing the relay.
• Error inside the inverter and cannot be checked externally.
By its nature, the alarm only occurs prior to connection to the
grid
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E021
- Self Test Error 2
-
Alarm LED
Failure of the test on the inverter's relay (DC-AC
circuit):
Before connecting to the grid the inverter carries out in-
ternal tests. One of these tests concerns the correct op-
eration of the inverter relay. The test is carried out by “forc-
ing” the switching of the relay and checking its operation.
The error is generated if a problem is found in action-
ing the relay.
• Error inside the inverter and cannot be checked externally.
By its nature, the alarm only occurs prior to connection to the
grid
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E022
- Self Test Error 4
-
Alarm LED
Timeout of the tests undertaken on the relays in-
side the inverter:
Execution time for the autotest carried out on the relay
of the DC_AC (inverter) circuit too high. It may indicate
a problem connected to the aforementioned relays
• Error inside the inverter and cannot be checked externally.
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E023
- DC in error
-
Alarm LED
Feeding of direct current to grid outside of range:
The error is generated if the continuous component of
the current supplied to the grid exceeds the threshold
of 0.5% of the normal operating current.
In any case the inverter is not blocked due to the E023
error, but tries to reconnect to the grid.
The sporadic repetition of the error is a sign of seri-
ous grid distortions or sharp irradiation changes, while
systematic repetition of the error signal will indicate a
breakdown on the inverter
Once the error occurs, the inverter tries to return to normal op-
eration.
- Should the error occur sporadically, it may be caused by a
brusque transition of the grid voltage or of the input voltage, but
is not due to a malfunction by the inverter.
- If the error is connected to an internal breakdown, it will con-
tinue to appear and so it is necessary to contact customer as-
sistance.
- E024
- Internal error
-
Alarm LED
Error inside the inverter:
Error inside the inverter
• Error inside the inverter and cannot be checked externally.
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E025*
- Riso Low
-
Alarm LED
Low value of insulation resistance:
Before connecting to the grid the inverter measures the
insulation resistance of the PV generator compared to
ground. Should the measurement of the insulation resist-
ance be below 1Mohm, the inverter does not connect to the
grid and shows the “Riso Low” error. The causes may be:
- PV panel(s) damaged;
- Junction box(es) of the panels not correctly sealed, so
as to permit inltration by water and/or humidity;
- Problems in connections between panels (not per-
fectly t);
- Poor quality of cable joints;
- Presence in the DC section of unsuitable or damaged
overvoltage surge arresters outside the inverter (re-
duced ignition voltage compared to the characteristics
of the strings of the PV generator);
- Presence of humidity inside any junction box
• Measure the insulation resistance using a megohmmeter posi-
tioned in the photovoltaic eld (positive terminal short-circuited
at the negative pole) compared to ground. The measurement is
strongly inuenced by the environmental conditions, so must be
made under the same conditions in which the error occurred.
- If the value measured is lower than 1 megaohm, a check must
be carried out by a technician/installer on the photovoltaic gen-
erator to identify and eliminate the problem.
- If the value measured is higher than 1 megaohm and the error
signal persists, contact customer assistance.
- E026
- Vref Error
-
Alarm LED
Internal reference voltage outside of range:
Wrong measurement of reference voltage inside in-
verter
• Error inside the inverter and cannot be checked externally.
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E027
- Error Meas V
-
Alarm LED
Grid voltage outside of range:
Error in the internal measurement of grid voltage (set
by law) in order to have a redundant measurement (2
measurements on the same parameter made by two
different circuits)
• Error inside the inverter and cannot be checked externally.
- If the problem persists (once the inverter has been switched
off and back on again), contact customer assistance.
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