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Troubleshooting
Code Meaning
27
BMS comm.fail
(BMS commu-
nication fail)
28
Fan fail
30
Grid Phase
error
31
Arc Fault
32
bus soft fail
(bus software
fail)
33
inv soft fail
(inverter soft-
ware fail)
34
bus short
(bus short
circuit)
35
inv short
(inverter short
circuit)
36
fan fault
74
Description
The communica-
tion between
the lithium
battery and the
inverter
is abnormal.
The fan / cooling
is not working
correctly.
The power grid
phase
sequence is
incorrectly
connected.
A PV arc fault is
present.
The inverter may
be damaged.
The fan / cooling
is not working
correctly.
Suggested solutions
• Check the cable, the crystal and the
wiring sequence.
• Check the battery switch.
• Check whether the inverter tempera-
ture is abnormal.
• Check whether the fan runs properly
(If you can see it).
• Check the power grid wiring.
• Check the photovoltaic panels and the
PV cable.
• Restart the inverter and wait until it
functions normally.
• Check whether the inverter tempera-
ture is abnormal.
• Check whether the fan runs properly
(If you can see it).
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