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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
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.
F48 AC lower frequency
Grid frequency out of range
1. Check if the frequency is in the
range of specification
2. You may need to adjust the
frequency on the grid set up
page.
F56 DC bus bar voltage is too low
Battery low voltage
1. Check if the battery voltage is too
low.
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