DC input polarity reverse fault
Check the PV input polarity.
DC insulation impedance permanent fault
Check the grounding cable of inverter.
DC leakage current fault
Hardly appear the code. Never ever happened so far.
Ground fault GFDI
Check the solar panel output connection.
Read the memory error
Failure in reading memory (EEPROM). Restart the inverter if
the fault still exists, contact your installer or Sunsynk service.
Write the memory error
Failure in writing memory (EEPROM). Restart the inverter if
the fault still exists, contact your installer or Sunsynk service.
GFDI blown fuse
Hardly appear the code. Never ever happened so far.
GFDI grounding touch failure
Hardly appear the code. Never ever happened so far.
IGBT damaged by excessive drop voltage
Hardly appear the code. Never ever happened so far.
Auxiliary switch power supply failure
Hardly appear the code. Never ever happened so far.
AC main contactor errors
Hardly appear the code. Never ever happened so far.
AC auxiliary contactor errors
Hardly appear the code. Never ever happened so far.
Working mode changed/Grid
mode changed
Hardly appear the code. Never ever happened so far.
DC firmware over current
Hardly appear the code. Never ever happened so far.
AC firmware over current
1. The internal AC sensor or detection circuit on control
board or connection wire may loose.
2. Restart the inverter, if the error still exists, please contact your installer or Sunsynk service.
GFCI(RCD) Ac leakage current fault
1. This fault means the average leakage current is over
300mA. Check whether DC power supply or solar panels
is ok, then check ‘Test data’-> ‘diL’ value is about 120;
Then check the leakage current sensor or circuit( the following picture). Checking test data needs using big LCD.
2. Restart the inverter, if the error still exists, please contact your installer or Sunsynk service.
Three phase current, over-current
fault
Hardly appear the code. Never ever happened so far
AC over current fault of hardware
1. Check AC sensor or detection circuit on control board or
connection wire.
2. Restart the inverter or factory reset, if the error still exists, please contact your installer or Sunsynk service.
All hardware failure synthesis
1. When inverter is running, wifi plug plugin,will occur F19.
2. Restart the inverter or factory reset, if the error still exists, please contact your installer or Sunsynk service.
DC over current fault of the hardware
Not available
DC leakage flow fault
Hardly appear the code. Never ever happened so far
Crash stop (if there is a stop button)
Contact your installer for help
AC leakage current is transient
over current
1. This fault means the leakage current is above 30mA
suddenly. Check whether DC power supply or solar
panels is ok, then check ‘Test data’-> ‘diL’value is about
120; Then check the leakage current sensor or circuit.
Check test data needs using big LCD.
2. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
DC insulation impedance failure
1. Check Vpe resistance on main board or detection on
control board. Check PV panels is OK. Many times this
issue is the PV problem.
2. Check whether the PV panel (aluminum frame) is grounded well and inverter is grounded well. Open the cover of
inverter and then check the inside ground cable is fixed
well on the shell.
3. Check if the AC/DC cable, terminal block are shorted to
ground or the insulation is damaged.
4. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
DC feedback fault
Hardly appear the code. Never ever happened so far.
The DC busbar is unbalanced
Hardly appear the code. Never ever happened so far.
DC end insulation error
Hardly appear the code. Never ever happened so far.
Inverter 1 DC high fault
Hardly appear the code. Never ever happened so far.
AC load switch failure
Hardly appear the code. Never ever happened so far.
AC main contactor failure
1. Check relays and AC voltage of relays.
2. Check relays driver circuit.
3. Check if the software is not suitable for this inverter. (Old
inverter not have relays detection function)
4. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
DC boost soft start
Not available.
Inverter 2 DC high fault
Hardly appear the code. Never ever happened so far.
AC over current
AC current sensor or its circuit have issue. Check if the inverter type is not right.
AC current over load
Hardly appear the code. Never ever happened so far.
No AC grid
1. Check AC grid voltage. Check AC voltage detection circuit. Check if the AC connector in good condition. Check
whether the AC grid is normal in voltage.
2. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
AC grid phase error
Hardly appear the code. Never ever happened so far.
AC three-phase voltage unbalance
failure
Hardly appear the code. Never ever happened so far.
AC three-phase current unbalance
failure
Hardly appear the code. Never ever happened so far.
AC over current(one cycle)
1. Check AC current sensor and its circuit.
2. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
DC over current
Hardly appear the code. Never ever happened so far.
AC Line W,U over voltage
Check the AC voltage protection setting. And Check if the AC
cable is too thin. Check the voltage difference between LCD
and meter.
AC Line W,U low voltage
Check the AC voltage protection setting. Check the voltage
difference between LCD and meter. Also need to check
whether AC cables are all firmly and correctly connected.
AC Line V,W over voltage
Not available.
AC Line V,W low voltage
Not available.
AC Line U,V over voltage
Not available.
AC Line U,V low voltage
Not available.
AC Over frequency
Check the frequency protection setting.
AC lower frequency
Check the frequency protection setting.
U phase grid current DC component over current
Hardly appear the code. Never ever happened so far.
V phase grid current DC component over current
Hardly appear the code. Never ever happened so far.
W phase grid current DC component over current
Hardly appear the code. Never ever happened so far.
AC inductor A, phase current
DC current high
Hardly appear the code. Never ever happened so far.
AC inductor B, phase current
DC current high
Hardly appear the code. Never ever happened so far.
AC inductor C, phase current
DC current high
Hardly appear the code. Never ever happened so far.
DC busbar voltage is too high
1. Check PV voltage and Ubus voltage and its detection
circuit. If the PV input voltage exceeds the limit, please
reduce the number of solar panels in series.
2. For Ubus voltage, please check the LCD display.
DC busbar voltage is too low
1. It tells the PV input voltage is low and it always happens
in the early morning.
2. Check PV voltage and Ubus voltage. When inverter is
running, then showing F56, maybe Loss of driver or
need update firmware.
3. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.
AC reverse irrigation.
AC reverse irrigation.
AC grid U over current
Hardly appear the code. Never ever happened so far.
AC grid V over current
Hardly appear the code. Never ever happened so far.
AC grid W over current
Hardly appear the code. Never ever happened so far.
Reactor A phase over current
Hardly appear the code. Never ever happened so far.
Reactor B phase over current
Hardly appear the code. Never ever happened so far.
ARC fault
1. Check PV module cable connection and clear the fault;
2. Seek help from us, if can not go back to normal state.
IGBT heat sink high temperature
1. Check temperature sensor. Check if firmware is suitable
for the hardware. Check if the inverter is its right model.
2. Restart the inverter, if the fault still exists, contact your
installer or Sunsynk service.