45
09 Maintenance
User Manual V1.0-2023-03-20
No. Fault Cause Solutions
12 ISO Fail
1. The PV string is
short-circuited to the
ground.
2. The PV system is in a
moist environment
and the circuit is not
well insulated to the
ground.
1. Check whether the PV input cables are
broken.
2. Check whether the module frames and the
metal bracket are securely grounded.
3. Check whether the AC side is properly
grounded.
13 Vac Failure
The utility grid voltage is
out of the allowed range.
1. Check whether the AC output voltage of the
inverter meets the grid requirements.
2. Make sure that the phase sequence of the
AC cables are connected correctly, and the
neutral wire and PE cable are connected
properly and rmly.
14
ExFan
Failure
1. The fan power supply
is abnormal.
2. Mechanical exception.
3. The fan is aging and
damaged.
Disconnect the AC output switch and DC input
switch, then connect them 5 minutes later.
Contact the dealer or the after-sales service if
the problem persists.
15 GFCI Chk Fail
The sampling of the GFCI
HCT is abnormal.
16 AFCI Fault
1. The PV string
terminal is not rmly
connected.
2. The DC cable is
broken.
Please check whether the wiring of the
PV modules are correct according to the
requirements in the user manual.
17
Over
Temperature
1. The inverter is
installed in a place
with poor ventilation.
2. The ambient
temperature exceeds
60℃.
3. A fault occurs in the
internal fan of the
inverter.
1. Check the ventilation and the ambient
temperature at the installation point.
2. If the ventilation is poor or the ambient
temperature is too high, improve the
ventilation and heat dissipation.
3. Contact the dealer or after-sales service
if both the ventilation and the ambient
temperature are proper.
18 InFan Fail
1. The fan power supply
is abnormal.
2. Mechanical exception.
3. The fan is aging and
damaged.
Disconnect the AC output switch and DC input
switch, then connect them 5 minutes later.
Contact the dealer or the after-sales service if
the problem persists.
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