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Error Code Description Solutions
F13 Working Mode Change
Inverter work mode changed
1. Reset the inverter.
2. Seek help from Sunsynk.
F18 AC over current fault or hardware
AC Slide over current fault.
1. Check if the backup load power is
within the range of the inverter.
2. Restart, and check if it is normal.
F20
DC over current fault of the
hardware
DC Over current fault
1. Check if PV module and battery
connections.
2. Reset the system.
F23
AC leakage current is trans over
current
Leakage current fault
1. Check the PV module and inverter
cables.
2. You may have a faulty PV panel
(earth short)
3. Restart inverter
F24 DC insulation impedance failure
PV isolation resistance is too low
1. Check if the connection of PV
panels and inverter are firmly
connected.
2. Check if the earth bond cable on
inverters is connected to the
ground.
F26 The bus bar is unbalanced
1. Please wait 5 minutes to see if it
returns to normal.
2. Fully reset the inverter.
F35 No at: grid
1. Check if the inverter’s connected
to the AC grid.
2. Check if the RSCD had not
tripped.
3. Check if the switch and fuses
between the inverter and grid are
all switched on.
F42 AC line low voltage
Grid voltage fault
1. Check if the voltage is in the range
of standard voltage in specification
this can be adjusted via the grid
set up page.
2. Check if grid cables are correctly
connected.
F47 AC over frequency
Grid voltage fault
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