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9
Trouble shooting
Our quality control program assures that every inverter is manufactured to accurate
specifications and is thoroughly tested before leaving our factory. If you have
difficulty in the operation of your inverter, please read through the following
information to correct the problem.
9.1 Error Messages displayed on LCD
An error message will be displayed on the LCD screen when a fault occurs. The faults
consist of system fault and inverter fault.
You may be advised to contact manufacturer in some situation, please provide the
following information.
Information concerning the inverter:
Serial number
Model number
Error message on LCD
Short description of the problem
Grid voltage
DC input voltage
Can you reproduce the failure? If yes, how?
Has this problem occurred in the past?
What was the ambient condition when the problem occurred?
Manufacturer name and model number of the PV panel
Output power of the panel
Voc of the panel
Vmp of the panel
Imp of the panel
Number of panels in each string
Information concerning the PV panels:
If it is necessary to replace the unit, please ship it in the original box.
9.2 System fault
System fault (system faults are mainly caused by system instead of inverter, please
check the items as instructed below before replacing inverter).
Error message
Description
Suggestion
Error: 124
No AC connection
Check AC wiring.
Check the status of AC breaker
PV Isolation Low Insulation problem
1. Check if panel enclosure ground
properly.
2. Check if inverter ground properly.
3. Check if the DC breaker gets wet.
4. Check the impedance of PV (+) & PV (-)
between ground (must be more than 50
K
Ω
or 1000 K
Ω
(VDE 0126)). If the error
message is displayed despite the above
checking passed, contact Growatt.
Residual I High
Error: 126
Leakage current too
high
1.Restart the invert.
2. If error message still exists, contact
Growatt.
PV Voltage High
Error: 128
The DC input voltage is
exceeding the maximum
tolerable value.
1. Disconnect the DC switch immediately.
2. Check the voltage of each PV string with
multimerter.
3. If the voltage of PV string is lower than
1000V, contact Growatt.
Error: 125
Auto Test Failed Auto test didn’t pass.
Restart inverter, repeat Auto Test, if
problem still exist, contact Growatt.
AC V Outrange
Error: 129
Utility grid voltage is out
of permissible range.
Please switch off DC switch.
Check AC wiring, especially neutral and
ground wire.
Check grid voltage is complied with local
grid standard. Restart inverter, if problem
still exist, Contact Growatt.
AC F Outrange
Error: 130
Utility grid frequency out
of permissible range.
Please switch off DC switch.
Check AC wiring, especially neutral and
ground wire.
Check grid frequency is complied with local
grid standard. Restart inverter, if problem
still exist, Contact Growatt.
