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11
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.
11.1 Error Messages displayed on OLED
An error message will be displayed on the OLED screen when a fault occurs. The faults
consist of system fault and inverter fault.
You may be advised to contact Growatt in some situation, please provide the following
information.
Information concerning the inverter:
Serial number
Model number
Error message on OLED
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?
Information concerning the PV panels:
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
If it is necessary to replace the unit, please ship it in the original box.
11.2 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
Residual I High
Error: 201
Leakage current too high
1.Restart the invert.
2. If error message still exists,
contact Growatt.
PV Isolation Low
Error: 203
AC V Outrange
Error: 300
No AC connection
Error: 302
PE abnormal
Error: 303
Insulation problem
Utility grid voltage is out
of permissible range.
No AC connection
1. Check if panel enclosure ground
properly.
2 . C h e c k i f i n v e r t e r g r o u n d
properly.
3. Check if the DC breaker gets
wet.
4. Check the impedance of PV (+) &
PV (-) between ground (must be
more than 25 K
Ω
or 500 K
Ω
(VDE
0126)). If the error message is
d i s p l a y e d d e s p i t e t h e a b o v e
checking passed, contact Growatt.
Please switch off DC switch.
C h e c k A C w i r i n g , e s p e c i a l l y
neutral and ground wire.
Check grid voltage is complied
with local grid standard. Restart
inverter, if problem still exist,
Contact Growatt.
Check AC wiring.
Check the status of AC breaker
AC F Outrange
Error: 304
Utility grid frequency out
of permissible range.
Please switch off DC switch.
C h e c k A C w i r i n g , e s p e c i a l l y
neutral and ground wire.
Check grid frequency is complied
with local grid standard. Restart
inverter, if problem still exist,
Contact Growatt.
Voltage of Neutral and PE
above 30V.
1.Check the voltage of Neutral
and PE.
2.Check AC wiring.
3.Restart inverter, if error message
still exisits,contact Manufacturer
Restart inverter, repeat Auto Test,
if problem still exist, contact
Growatt.
Auto Test Failed
Error: 407
Auto test didn't pass.
PV Voltage High
Error: 202
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
l o w e r t h a n 5 5 0 V, c o n t a c t
Growatt.
