- Error code
- Error message
- Warning
Name of Alarm and Cause Solution
- E018
- Ground Fault
-
Red LED
High leakage current measured on the DC side
(photovoltaic generator):
The alarm is generated when, during normal operation
of the inverter, a leakage current to ground is detected
in the DC section of the system. It is also possible
that the inverter generates the alarm E018 message
also due to AC leakage currents connected to the
capacitive nature of the photovoltaic generator
compared to ground.
• Measure the insulation resistance using a megohmmeter
positioned in the photovoltaic array (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 generator to identify and eliminate the problem.
- If the value measured is higher than 1 megaohm and the
error signal persists, contact customer assistance.
- E019
- Ileak sense.fail
-
Yellow LED
Failure of test on sensor to measure the leakage
current (DC side):
Before connecting to the grid the inverter runs a
self-test regarding the sensor for the leakage current.
The test is carried out by “forcing", in the sensor of
the leakage current, a current with a known value:
the microprocessor 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 persists (once the inverter has been switched
off and back on again), contact customer assistance.
- E020
- Self Test Error 1
-
Yellow LED
Failure of the test on the relay of the “Booster”
(DC-DC circuit):
Before connecting to the grid, the inverter carries
out some internal tests. One of these tests concerns
the correct operation of the booster relay. The test is
carried out by “forcing” the switching of the relay and
checking its operation.
The error is generated if a problem is found in
actioning 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
-
Yellow LED
Failure of the test on the inverter's relay (DC-AC
circuit):
Before connecting to the grid, the inverter carries
out some internal tests. One of these tests concerns
the correct operation of the inverter relay. The test is
carried out by “forcing” the switching of the relay and
checking its operation.
The error is generated if a problem is found in
actioning 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
-
Yellow LED
Timeout of the tests undertaken on the relays
inside the inverter:
Execution time for the self-test 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
-
Yellow LED
Feeding of direct current to grid outside of range:
The error is generated if the direct component of the
current supplied to the grid exceeds the threshold of
0.5% of the rated operating current.
In any case, the inverter does not stop because of the
E023 error, but tries to connect to the grid again.
The sporadic repetition of the error is a sign of serious
grid distortions or sharp irradiation changes, while
systematic repetition of the error signal will indicate a
breakdown on the inverter
Once the error appears, the inverter attempts to resume
normal operation.
- 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 fault, it will continue to
appear and so it is necessary to contact customer assistance.
- E024
- Internal error
-
Yellow 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.
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