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9 Inverter status diagnostics and repair
The PV Inverter is equipped with a self diagnostic system that automatically
identifies many possible operational issues and displays information about them
on the LCD. Therefore it is possible to quickly isolate technical problems and to
distinguish between service codes related to the installation and service codes
which are internal to the inverter. Whenever the diagnostic system identifies a
particular issue the respective service code is displayed on the LCD.
Table 2. Inverter error codes and descriptions
LCD
Designation
Description
Repair
Er00
DC_BUS
pre-charge failure
The inverter is in the soft start
procedure, but the DC bus cannot
reach and maintain anticipative
charging voltage
1. Disconnect ALL PV (+) and
PV (-) cables.
2. Wait for a few seconds.
3. After the LCD switches off
reconnect and check again.
4. If the error code keeps
recurring contact your local
distributor.
Er07
DC_BUS
over-voltage
The DC bus voltage is lower or
higher than expected.
Er08
DC_BUS
under-voltage
Er17
EEPROM ERROR
on the control
board
EEPROM data is wrong.
Er22
Output relay failure
The inverter’s output relay is
abnormal.
Er24
Output current
sense failure
The inverter’s output current fails to
be detected.
Er25
BOOSTER_A
over-current
Over-current on the DC side. This
fault code is displayed if the current
in the DC network is larger than
specified.
Er26
BOOSTER_B
over-current
Er06
EPO
Inverter enters into EPO mode
(Emergency Power Off).
1. Remove the short circuit
occurring at the EPO terminal.
2. If the error code keeps
recurring contact your local
distributor.
Er09
Inverter output
over-current
Over-current on the AC side. This
fault code is displayed if the current
in the AC network is larger than
specified.
1. Turn off the AC breaker, then
check the peripheral AC
system configuration and the
grid conditions.
2. If the error code keeps
recurring contact your local
distributor for help.
Er11
Inverter overload
Overload on the AC side. This fault
code is displayed if the load in the
AC network is larger than specified.
Er13
Inverter short
circuit
Short circuit on the AC side
Er14
Inverter PLL failure
The phase of the inverter cannot
synchronize with the utility.
Er29
Inverter output DC
current over spec.
The DC component of the electricity
fed into the grid is larger than the
permissible range.
Er10
Inverter Over
temperature
The internal temperature is too
high.
1. Try to reduce the ambient
temperature.
2. Move the inverter to a cooler
39
Er18
Heat sink over
temperature
The heat sink temperature is too
high.
place.
3. If the error code keeps
recurring contact your local
distributor for help.
Er02
Slave MCU failure
Slave MCU failure
1. If the error code keeps
recurring contact your local
distributor for help.
Er05
Watch Dog
DSP Watch Dog
Er12
Charger fault
DC BUS pre-charge failure
Er15
Slave Info fail
The data check failed between two
MCUs.
Er27
Booster Short
Circuit
Short-current on the DC side.
Er41
Boost A Sense fault
Current sensor fault on the stringA
of DC side.
Er42
Boost B Sense
fault
Current sensor fault on the stringB
of DC side.
Er43
Out Balance Sense
fault
Current sensor fault on the AC side.
Er37
Fan fault
A fan is not rotating.
1. Check the fans.
2. If the error code keeps
recurring contact your local
distributor for help.
