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STI Repair - White Logo
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Inverter Aurora Power One Stringa

✓ PVI 3.0
✓ PVI 3.6
✓ PVI 4.2
✓ PVI 5000
✓ PVI 6000
✓ PVI 10.0
✓ PVI 12.5
✓ TRIO 5.8
✓ TRIO 7.5
✓ TRIO 8.5
✓ TRIO 20.0
✓ TRIO 27.6

POWER ONE STRING

Listed below are the requirements for initial action on a failed inverter. Before proceeding with any operation: A) Verify that the model is correct; B) Carefully follow all instructions provided in the manufacturer’s operation and maintenance manual; C) Ensure that the intervention is carried out by trained personnel; D) Since this is a photovoltaic inverter with a DC input that is always live, strictly observe all applicable safety regulations.

Alarms, Errors and Warnings

Codice errore a display
Messaggio di errore
Segnalazione
Nome allarme e causa
Possibile soluzione

No code

Ground F

Red led

Ground fault of the PV generator:
The alarm is generated when a current is detected
of earth leakage in the DC section of the system.

- Make an insulation resistance measurement using.
A megohmeter placed between the PV array (terminal
positive shorted to the negative pole) with respect to ground. The measure
Is strongly influenced by environmental conditions so
must be carried out under the same conditions under which the error was
manifested.
- Should the measured value be less than 1megaohm
An inspection by a technician/installer must be carried out on the
PV generator to identify and eliminate the problem.
- Should the measured value be more than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.

No code

NEW COMPONENT REJECTED!

Led yellow Lamp.

Failure to associate the new component:
The components inside the inverter (e.g., display, fuse board,
communication and control board, etc.) not
Are associated with each other. This condition occurs
Following the replacement of one of the internal components
To the inverter.

- Associate internal components with the inverter by accessing the menu
"Settings > Service > Accept boards" (refer to the
procedure given in this manual).
- In case the report continues to be present at
following association contact STI Service Repair.

No code

SET COUNTRY or
NO NATION

No Led

SET COUNTRY or NO NATION:
Indicates that the following was not set during installation
The grid standard on the inverter.

- Set the network standard of the country of installation by following
The instructions in the present of the inverter.
- In case the report continues to be present at
following the setting of the network standard contact Service STI Repair.

No code

Vac absent

Yellow led

Vac absent:
The inverter displays the message "Vac absent" on the display.
When it does not detect the output voltage (AC side).

- Check the line voltage at the AC terminal block of the inverter.
- In case it is absent, check for protections
on the line and the presence of line voltage at the point of
supply.

No code

Mem. spoil

Yellow led

Faulty memory:
The inverter displays the message "Memory
fails" when it detects communication problem with the
memory card in which the inverter saves, daily,
The value of daily energy produced.

- Remove the memory card and check for proper soldering
Of all connector terminals. Then re-enter
the memory card and verify that it is properly
placed in the dedicated counterpart
- In case the alert continues to be present in
Following the above checks, contact STI Service Repair.

No code

Waiting for sunshine

Green led flash.

Waiting for sunshine:
The inverter displays the message "waiting for sun" on the display.
When, following a report of W001 and/or
W002, the voltage from the photovoltaic generator.
turns out to be less than the trigger voltage
(Vstart).

- Check the input voltage to the inverter.
- If it does not exceed Vstart check for sufficient irradiance
And the correct composition of the plant.
- If it exceeds Vstart contact Service STI Repair.

W001

Sun Low

Yellow led

Insufficient irradiation (Low input voltage
when turning on the inverter):
Misconfiguration of the PV generator or a
"borderline" configuration with regard to the minimum
Inverter input voltage.

- Check the input voltage to the inverter.
- If it does not exceed Vstart check for sufficient irradiance
And the correct composition of the plant.
- If it exceeds Vstart contact Service STI Repair.

W002

UV Input

Yellow led

Insufficient irradiation (Low input voltage
being shut down):
Misconfiguration of the photovoltaic generator or
A "borderline" configuration in terms of the minimum
inverter input voltage

Check the input voltage to the inverter:
- If it does not pass Vstart check for sufficient
irradiance and the correct composition of the system.
- If it exceeds Vstart contact Service STI Repair.

W003

Grid Fail

Yellow led

Mains voltage parameters out of range:
The signaling of this error occurs when during
the normal operation of the inverter the grid parameters
come out of the limits imposed by the operator:
- Line voltage absent (after signaling, the inverter
goes to "Vac Absent")
- Unstable line voltage (downward and upward)
- Unstable network frequency

- Check the line voltage on the inverter.
- If absent, check the absence of line voltage at the point
of supply.
- If, on the other hand, the voltage tends to rise (when the inverter
is connected) high line or network impedances are present.
- Check the mains voltage also on the supply:
- If it is high, it means that a high impedance of
network. In such a case, ask for an adjustment of the grid voltage
To the manager. If the operator authorizes a change to the parameters
of the inverter agree the new limits with the Service STI Repair.
- If the voltage at the supply point is much lower than
to that measured on the inverter, it is necessary to adjust the line
(inverter-counter).
- If the line voltage and frequency are found to be within the limits
(even when the inverter is connected to the network) contact Service STI Repair.

W009

Empty Table

Yellow led

Characterization table of the wind generator not
filled in (WIND models only)

(WIND models only)

W010 (not shown on display)

Faulty fan!

Yellow led flash.

Faulty fan:
This error occurs in the presence of a malfunctioning
Of the whole fan(s) to the inverter.

- Error internal to the inverter and not externally verifiable.
- Should the alarm persistently recur, contact
the Service STI Repair.

W011

Bulk UV

Yellow led

Low voltage of "Bulk" (DC-DC circuit):
The alarm (which is an alert and not an error), is generated
When the voltage at the ends of the bulk capacitors
Does not reach the threshold for inverter operation
(internal threshold that cannot be changed).

- Raise the value of the activation voltage (Vstart) to.
to have sufficient power from the PV generator at the time of the
grid connection of the inverter.
- Check the input voltage to the inverter.
- If it does not pass Vstart check for sufficient
irradiance and the correct composition of the system.
- If it exceeds Vstart contact Service STI Repair.

W012 (not shown on display)

Batt. unloaded

Yellow led

Low battery:
The inverter displays the message "Low Battery" on the display.
When it detects a buffer battery voltage
too low.

- Check that the date/time is set correctly and, if
are not, set them.
Then arrange to turn off the inverter completely
(both AC and DC side) and wait for a few minutes.
Finally, restart the inverter and check whether the date/time are still
set correctly or whether they are reset to 01/01/2000.
In this case, replace the inverter battery completely
off (disconnect AC and DC side) paying attention to compliance with the
of polarity

W013 (not shown on display)

Faulty clock

Yellow led

Faulty clock:
The alarm occurs when a difference is created
Greater than 1 minute in the hour shown on the display
than the internal microprocessors and indicates
A clock circuit malfunction.

- Error internal to the inverter and not externally verifiable.
- Should the alarm persistently recur, contact
the Service STI Repair.

W017 (only for models with monitored string fuses)

String. Err.

Yellow led flash.

Error detected in the measurement of string currents:
Damaged string protection fuse(s)

- Check with a multimeter the status of the fuses (located on the
fuse boards).
- If one or more fuses are open provide replacement and check
That the input current on the string(s) does not exceed the rating
Of the fuses (in case string parallels were made
external to the inverter).
- If no damaged string fuses are present and the inverter
continues to display the alarm message check whether
The settings to be made through the Aurora Manager software are.
correct (presence or absence of one or more input strings).

W018 (only for models with
SPD monitored)

SPD DC Err

Yellow led flash.

Tripping of DC-side surge arresters:
Surge arresters placed on the DC side damaged

- Observe the inspection window on each arrester
(DC side). If it is red, the arrester is damaged and will
Must arrange for the replacement of the cartridge.
- If the alarm status continues to be present even though
all dischargers have green inspection window
contact STI Service Repair.

W019 (only for models with
SPD monitored)

SPD AC Err

Yellow led flash.

Tripping of AC-side surge arresters:
Surge arresters placed on the AC side damaged

- Observe the inspection window on each arrester
(AC side). If it is red, the arrester is damaged and will
Must arrange for the replacement of the cartridge.
- If the alarm status continues to be present even though
all dischargers have green inspection window
contact STI Service Repair.

W022 (not shown on display)

Reactive power mode changed

No Led

Variation of power management mode
responsive:
Change of reactive power management mode;
such variation can be made by display
or advanced configuration software.

- The change of reactive power management mode.
Is carried out directly by the customer/installer and does not constitute
A mistake. The information is only saved on the history of the
events stored by the inverter

W023 (not shown on display)

date/time changed

No Led

Changing the date and time of the inverter:
Change in the date and time of the inverter; this change
Can be done via display or configuration software
advanced.

- The change of the internal date and time of the inverter is carried out
directly from the customer/installer and does not constitute a
error. The information is only saved on the history of the
events stored by the inverter

W024 (not shown on display)

Energy data reset

No Led

Resetting of stored energy statistics data.
in the EEPROM:
Reset of energy data saved internally in the inverter;
such operation can be done by display or
Advanced configuration software.

- Resetting the partial energy values stored by the inverter to zero.
Is carried out directly by the customer/installer and does not constitute
A mistake. The information is only saved on the
history of events stored by the inverter.
- The report can also be submitted in the case of replacement
Of the memory card where production statistics data are saved

E001

Input OC

Yellow led

Input overcurrent (photovoltaic generator):
The alarm occurs when the input current
Of the inverter exceeds the threshold of maximum input current
Of the inverter.

- Check whether the composition of the PV generator allows for
Have an input current that exceeds the maximum threshold
allowed by the inverter and that the configuration of the inputs (independent
or in parallel) is carried out correctly.
- If both checks are successful, contact STI Service Repair.

E002

Input OV

Yellow led

Input overvoltage (photovoltaic generator):
The alarm is generated when the input voltage
(from the PV generator) exceeds the threshold of maximum
Inverter input voltage.
The alarm intervenes before the threshold is reached
absolute beyond which the inverter is damaged.
When the input voltage of the inverter exceeds the threshold
of Over Voltage, the inverter, will not start because of the
alarm generation.

- It is necessary to measure with a voltmeter the input voltage
internal to the inverter.
- If it turns out to be higher than the maximum voltage of the range
operational, the alarm is real and it is necessary to check the configuration
Of the PV generator. In case the voltage has exceeded
also the maximum input threshold the inverter could be
damaged.
- If it turns out to be less than the maximum voltage of the range
operational, it is an alarm induced by a malfunctioning
internal and it is necessary to contact the Service STI Repair.

E003

No Parameters

Yellow led

DSP initialization error:
The main microcontroller is unable to initialize
correctly the two DSPs (booster stage and inverter stage).
The error is caused by communication problems
On the internal bus of the inverter.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E004

Bulk OV

Yellow led

Overvoltage of "Bulk" (DC-DC circuit):
Internal inverter error. The alarm is raised when
The voltage at the ends of the bulk capacitors exceeds the
Over Voltage threshold (internal threshold that cannot be changed).

- The alarm may be caused by causes external to the inverter:
- Excessive input voltage can be detected as.
Bulk overvoltage condition. In this case it is advisable to
Check the input voltage of the inverter and if it
this value is close to the input OV threshold
Review the PV generator configuration.
- Excessive mains voltage could lead to the voltage of
bulk to rise in an uncontrolled manner resulting in intervention
Of the protection and thus alarm generation. In these cases
the alarm is transient and the inverter restarts automatically
- The alarm can be caused by causes internal to the inverter and in
this case it is necessary to contact the Service STI Repair.

E005

Comm.Error

Yellow led

Internal inverter communication error:
The alarm occurs when there are problems with the
Communication between the inverter's internal control devices.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E006

OC Output

Yellow led

Output overcurrent:
The alarm occurs when the output current
of the inverter exceeds the maximum current threshold of
inverter output.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E007

IGBT Sat

Yellow led

Saturation detected on IGBT components:
The alarm occurs when one of the active devices
Of the inverter is in the saturation state.

Once the error occurs, the inverter attempts to resume the
normal operation.
- In the event that the error occurs sporadically, it may be
Induced by an abrupt mains voltage transition or
Of the input voltage but is not attributable to a malfunctioning
Of the inverter.
- If the error is related to an internal failure, it will continue to occur
it is then necessary to contact the Service STI Repair.

E009

Internal error

Yellow led

Internal inverter error:
Internal inverter error

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E010

Bulk Low

Yellow led

Low voltage of "Bulk" (DC-DC circuit):
The alarm may be caused by causes external to the inverter:
A reduced inverter input voltage (by a little
higher than the trigger voltage) but at which it does not
is accompanied by sufficient power availability from
part of the photovoltaic generator (typical condition of the
phases with low irradiance)

- If the error report occurs sporadically you will
can attribute to causes external to the inverter (poor irradiation
And therefore diaponibility of little power from the generator
FV).
- If the problem also occurs systematically in
High irradiance conditions and with input voltage
significantly greater than the trigger voltage, contact
the Service STI Repair.

E011

Ramp Fail

Yellow led

High "Booster" entry time:
Internal inverter error related to the input time of
steady state work of the DC-DC circuit part (Booster)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E012

DcDc Fail

Yellow led

Error on the circuit part "Booster" (DC-DC side)
revealed by the "Inverter" circuit part (DC-AC side):
Internal inverter error related to the operation of the
DC-DC(Booster) circuit part

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E013

Wrong Mode

Yellow led

Incorrect input configuration (set in parallel
instead of independent):
The alarm is generated only when the inverter
Is configured with parallel inputs. In this particular
configuration, the inverter performs control of the
input voltage of each of the two channels and whether the
two voltages differ from each other by more than 20Vdc is
raised the alarm.

- Verify that the setting of the "IN MODE" switch is deliberately
set to "PAR" and that the jumpers have been inserted.
Between the two input channels.
- If the configuration of the inverter is correct, check that the
input strings have the usual number of panels in series,
Of the usual brand and with the same tilt/orientation.
- Whether both the configuration of the inverter and the characteristics of the
PV generator are in accordance with specifications contact Service STI Repair.

E014

Over Temp.

Yellow led

Overtemperature inside the inverter:
Outdoor temperatures above 60°C. This parameter
also depends on the power that the inverter has to
deliver as the measurement of temperatures is made
internally and is affected by the heat dissipated by the
components of the inverter itself

- Make sure the inverter is not exposed to direct sunlight.
Wait for the temperatures to which the inverter is exposed to return to
in the operating range and that the inverter is able to cool down.
- If the problem (once the room temperature has
reported in the range) should persist contact Service STI Repair. Remember to wait a necessary amount of time to allow
to the inverter to cool down

E015

Bulk Cap Fail

Yellow led

Fault detected on "Bulk" capacitor:
Internal inverter error related to problem in capacitors
of bulk.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E016

Inverter Fail

Yellow led

Error on the circuit part "Inverter" (DC-AC side)
revealed by the "Booster" circuit part (DC-DC side):
The alarm is generated when a problem is detected
In the circuit part inverter(DC/AC)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E017

Start Timeout

Yellow led

High "Inverter" steady-state entry time:
Internal inverter error related to the input time of
steady state work of the DC-AC circuit part (Inverter).
The alarm may be caused by causes external to the inverter:
A reduced inverter input voltage (by a little
higher than the trigger voltage) but at which it does not
is accompanied by sufficient power availability from
part of the photovoltaic generator (typical condition of the
phases with low irradiance)

- If the error report occurs sporadically you will
can attribute to causes external to the inverter (poor irradiation
And therefore diaponibility of little power from the generator
FV).
- If the problem also occurs systematically in
High irradiance conditions and with input voltage
significantly greater than the trigger voltage, contact Service STI Repair.

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 is detected a current of
Earth leakage in the DC section of the system.
It is also possible for the inverter to generate the message of
E018 alarm also for AC leakage currents bound
To the capacitive nature of the photovoltaic generator
Than on the ground.

- Make an insulation resistance measurement using.
A megohmeter placed between the PV array (terminal
positive shorted to the negative pole) with respect to ground. The measure
Is strongly influenced by environmental conditions so
must be carried out under the same conditions under which the error was
manifested.
- Should the measured value be less than 1megaohm
An inspection by a technician/installer must be carried out on the
PV generator to identify and eliminate the problem.
- Should the measured value be more than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.

E019

Ileak sens.fail

Yellow led

Failure of current measurement sensor test
of dispersion (DC side) :
Before connecting to the grid, the inverter performs a self-test
concerning the leakage current sensor (Leakage).
The test is carried out by "forcing" into the sensor of the
leakage current a current of known value: the microprocessor
compares the read value with the known value.
The error is generated if the comparison between the value read
And the value known during the test is outside the tolerance
admitted.

- Error internal to the inverter and not externally verifiable.
By its nature, the alarm only manifests before the
network connection
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E020

Self Test Error 1

Yellow led

Failure of the test on the "Booster" relay (DCDC circuit):
Before connecting to the grid, the inverter performs tests
Interior. One of these tests concerns the proper functioning
Of the booster relay. The test is carried out by "forcing"
relay switching and verifying its functionality.
The error is generated if a problem is encountered
In the operation of the relay.

- Error internal to the inverter and not externally verifiable.
By its nature, the alarm only manifests before the
network connection
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E021

Self Test Error 2

Yellow led

Failure of the test on the "Inverter" relay (DCAC circuit):
Before connecting to the grid, the inverter performs tests
Interior. One of these tests concerns the proper functioning
Of the inverter relay. The test is carried out by "forcing"
relay switching and verifying its functionality.
The error is generated if a problem is encountered
In the operation of the relay.

- Error internal to the inverter and not externally verifiable.
By its nature, the alarm only manifests before the
network connection
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E022

Self Test Error 4

Yellow led

Timeout of tests performed on the inverter's internal relays:
Execution time of the self-test performed on relay of the
DC_AC (inverter) circuit part too high. It may indicate
A problem related to the above relays

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E023

DC inj error

Yellow led

Feeding DC power into the grid out of range:
The error is generated if the continuous component of the
Current delivered to the grid exceeds the threshold of 0.5% of the
rated operating current.
In any case, the inverter does not freeze because of the error
E023, but try to connect to the network again.
Sporadic repetition of the error is an indication of strong distortions
grid or abrupt changes in irradiance,
while a systematic repetition of the reporting of
error, it will be an indication of an inverter failure

Once the error occurs, the inverter attempts to resume the
normal operation.
- In the event that the error occurs sporadically, it may be
Induced by an abrupt mains voltage transition or
Of the input voltage but is not attributable to a malfunctioning
Of the inverter.
- If the error is related to an internal failure, it will continue to occur
it is then necessary to contact the Service STI Repair.

E024

Internal error

Yellow led

Internal inverter error:
Internal inverter error

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E025 (not shown on display)

Low Rice

Yellow led

Low value of insulation resistance:
Before connecting to the grid, the inverter performs the measurement
Of the insulation resistance of the PV generator vs.
on the ground. Where the measurement of insulation resistance
is less than 1Mohm, the inverter will not connect to the grid
and shows the error "Rice Low" . Causes may be:
- Damaged PV panel(s);
- Panel junction box(es) not correctly
sealed, such as to allow infiltration of water and/or
moisture;
- Problems in the connections between the panels (not perfectly
inserted);
- Poor quality cable splices;
- Presence in the DC section of surge arresters
external to the inverter unsuitable (trigger voltage
Reduced compared to the characteristics of the generator strings
PV) or damaged;
- Presence of moisture within the eventual framework of
camp

- Make an insulation resistance measurement using.
A megohmeter placed between the PV array (terminal
positive shorted to the negative pole) with respect to ground. The measure
Is strongly influenced by environmental conditions so
must be carried out under the same conditions under which the error was
manifested.
- Should the measured value be less than 1megaohm
An inspection by a technician/installer must be carried out on the
PV generator to identify and eliminate the problem.
- Should the measured value be more than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.

E026

Vref Error

Yellow led

Internal reference voltage out of range:
Measurement of the reference voltage inside the inverter
errata

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E027

Error Meas V

Yellow led

Line voltage out of range:
Error in internal measurement of line voltage (set
by regulations) to have redundancy of measurement
(2 measurements on the same parameter made by
two different circuits)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E028

Error Meas F

Yellow led

Grid frequency out of range:
Error in the internal measurement of the grid frequency (set
by regulations) to have redundancy of measurement
(2 measurements on the same parameter made by
two different circuits)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E029

Mid Bulk OV

Yellow led

Internal overvoltage on the "Mid bulk" measurement:
Internal inverter error (three-phase models only)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E030

Error Meas Ileak

Yellow led

High leakage current (DC side):
Error in internal measurement (made when the inverter
is connected to the grid) of the leakage current of the side
DC (PV generator) vs. ground (imposed by regulation)
To have redundancy of measurement (2
measurements on the same parameter made by two circuits
different)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E031

Error Read V

Yellow led

Output relay damaged:
Measurement of the internal voltage at the ends of the output relay
out of range. Too much voltage difference is present between
The input and output of the grid connection relay.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E032

Error Read I

Yellow led

Unbalanced output currents:
Measurement of output voltage unbalance (carried out
between the three phases) out of range (only in three-phase models)

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E033

UTH

Yellow led

Low ambient temperature:
Temperatures outside the inverter below -25°C

- Wait for the temperatures to which the inverter is exposed to return to
In the operating range.
- If the problem persists, contact STI Service Repair.
Remember to wait a necessary amount of time to allow
to the inverter to warm up.

E034

Interlock fail

Yellow led

"IGBT" circuitry not ready:
Internal inverter error

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E035 (not shown on display)

Remote Off

Yellow led

Inverter waiting for "remote ON" command:
The inverter has been turned off remotely (remote OFF) and remains
In a state of waiting for the signal that will turn it back on
(Remote ON)

- Turn the inverter back on remotely. If the unit does not turn on again,
Disable the power off/on function from
remote and perform a total equipment shutdown and
a subsequent restart.
- If the problem (once the Remote ON/
OFF from the display) persists contact Service STI Repair.

E036

Vout Avg errror

Yellow led

Average of out-of-range line voltage measurements:
The average value of the grid voltage (sampled every
10 minutes) is not within the permissible ranges. The tension of
grid at the point connected to the inverter is too high. This
can be caused by too high a network impedance.
In the final stage of timout, the inverter limits the power for
Check whether the mains voltage stabilizes in the regular
parameters. If this does not happen, the inverter will disconnect
from the net

- Check the mains voltage at the connection point of the inverter.
- If the line voltage deviates from the range due to conditions
of the distribution network ask for an adjustment of the
grid voltage to the operator. If the operator authorizes a change
to the inverter parameters agree the new limits with the Service STI Repair.

E037

Low Rice

Red led

Low insulation resistance value (only with "Amorphous" mode enabled):
This error can only occur if the mode
"Amorphous" is enabled. This function is enabled
only in inverters equipped with grounding kits and serves to
Monitor the voltage at the ends of the grounding resistor.
The error occurs when the voltage at the terminals
Of the collaged resistance between ground and generator pole
PV exceeds 30V for more than 30 minutes or 120V
For more than a second.

- Verify the presence and correct contacting of the two terminals
Of the grounding resistor installed inside the inverter
- Make an insulation resistance measurement using.
A megohmeter placed between the PV array (terminal
positive shorted to the negative pole) with respect to ground. The measure
Is strongly influenced by environmental conditions so
must be carried out under the same conditions under which the error was
manifested.
- Should the measured value be less than 1megaohm
An inspection by a technician/installer must be carried out on the
PV generator to identify and eliminate the problem.
- Should the measured value be more than 1megaohm
and the error report continues to be present, contact
the Service STI Repair.

E046

String selftest fail

No Led

Error during automatic voltage check
of string (only in models with "fuse-control" board):
In some inverter models, it is possible to carry out the test of
Checking the polarity of the strings connected to the input
(Es:TRIO-20.0/27.6kW).
The signaling of this error occurs when, during
the test phase, an inverted string is detected

- Disconnect the inverter and check the polarity of the string/strings
which the inverter detected as reversed.
- Once all the strings are correctly connected make
commissioning again; the inverter will again check the
The correct polarity of the string inputs at the end of the
Which will perform the checks for network connection.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E049

AC FF Error

Yellow led

Error in the "AC feed-forward" circuit part:
Internal inverter error

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.

E056

Over Temp. (from
external box)

Yellow led

Excessive temperature measured inside the inverter wiring box:
High internal temperature.
This error is related to the temperature measured on
external boxes (Ex:TRIO-20.0/27.6kW)

- Make sure the inverter is not exposed to direct sunlight.
Wait for the temperatures to which the inverter is exposed to return to
in the operating range and that the inverter is able to cool down.
- If the problem (once the room temperature has
reported in the range) should persist contact Service STI Repair. Remember to wait a necessary amount of time to allow
to the inverter to cool down

E057

Vbulk reading error

Yellow led

Input voltage (Vin) greater than the voltage
Of booster (Vbulk):
The error occurs if the input voltage exceeds the
Bulk voltage (voltage on the DC-DC circuit part.
internal to the inverter)

- It is necessary to measure with a voltmeter the input voltage
internal to the inverter.
- If it turns out to be higher than the maximum voltage of the range
operational, the alarm is real and it is necessary to check the configuration
Of the PV generator. In case the voltage has exceeded
also the maximum input threshold the inverter could be
damaged.
- If it turns out to be less than the maximum voltage of the range
operational, it is an alarm induced by a malfunctioning
internal and it is necessary to contact the Service STI Repair.

E058

Pin vs Pout check error

Yellow led

Error in checking Pin vs Pout:
The error occurs if the difference between the measured value of input power and output power is greater than the limit value set internally in the inverter.

- Error internal to the inverter and not externally verifiable.
- If the problem (once a shutdown and restart has been carried out.
of the inverter) should persist contact Service STI Repair.
Back on
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Contact us

0735.701148

366.7663877

Send us an email

Via dell'Artigianato IV Traversa, 5 63076 - Monteprandone (AP) ITA

Mon-Fri: 09:00 - 18:00

STI Repair - Logo Bianco
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