7 Troubleshooting
※ 7.1 Error Message
Error Message Description Troubleshooting
No Display No Display
① Check whether cables are all fi rmly connected
and DC switch is on.
② Check whether the input voltage meets the
working voltage.
Mains Lost
Grid power outage, AC switch or
circuit is disconnected.
① Check whether the mains supply is lost.
② Check whether the AC breaker and terminals
are well connected.
Grid Voltage Fault
Grid overvoltage or undervolt-
age, the grid voltage is higher
or lower than the set protection
value.
① Check whether the safety regulation setting is
correct.
② Check the voltage of the grid. If the grid volt-
age exceeds the allowed range of inverter pro-
tection parameters, please contact the local grid
company to resolve.
③ Check whether the impendence of the AC ca-
ble is too high. Replace with a thicker AC cable if
that is the case.
Error Message Description Troubleshooting
Grid Frequency
Fault
Grid over frequency or under-
frequency, the grid frequency
is higher or lower than the set
protection value.
① Check whether the safety regulation settings
are correct.
② Check the frequency of the grid. If the grid
frequency exceeds the allowed range of inverter
protection parameters, please contact the local
grid company to resolve.
ISO Over Limitation
Low system insulation resis-
tance, which is generally caused
by poor insulation to ground of
the module/cable or by rainy and
damp environment.
① Check whether the PV panels, cables, and
connectors are broken or water leaked.
② Check whether there is a reliable inverter
grounding line.
GFCI Fault Excessive leakage current.
① The ground current is too high.
② Check whether the PV cable has a short circuit
to ground.
PV Over Voltage PV over voltage is too high.
① Input voltage is too high.
② Reduce the number of PV panels to make sure
the open-circuit voltage of each string is lower
than the inverter max allowed input voltage.
Inverter Over Tem-
perature
Temperature anomaly, the tem-
perature of the interior of the
inverter is excessively high and
out of the safe range.
① Check whether the inverter is directly exposed
to the sunlight.
② Reduce ambient temperature.
DCI Fault
DC Injection Hight. Inverter de-
tects a higher DC component in
AC output.
① Restart the inverter, wait a moment for invert-
er recovery.
② If the fault occurs repeatedly, please contact
Sunways.
7 Troubleshooting7 Troubleshooting
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