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10
Trouble shooting
Sometimes, the PV inverter does not work normally, we recommend the following
solutions for common troubleshooting. The following table can help the technician
to understand the problem and take action.
10.1 Warnings(W)
Warnings(W) identify the current status of the Growatt MTL-S. Warnings do not
relate to a fault. When a (W) with a number after it appears in the display, it
indicates a Warning Code and is usually cleared through an orderly shutdown/re-
set or a self corrective action performed by the inverter. See the (W) codes in the
Error message
Description
Suggestion
No AC
Connection
AC V
Outrange
No utility grid
connected or utility
grid power failure
1.Check AC wiring.
2.Contact Growatt.
Utility grid voltage
is out of permissible
range.
1.Check grid voltage.
2.If the error message still exists despite the grid
voltage being within the tolerable range, contact
Growatt.
AC F
Outrange
Utility grid
frequency out of
permissible range.
1.Check grid frequency.
2.If the error message is displayed despite the
grid frequency being within the tolerable range,
contact Growatt.
Over
Temperature
Temperature
outrange
1.check the inverter operation state
2.If the error message is displayed still,please
contact Growatt.
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.If the error message is displayed despite the
above checking passed, contact Growatt.
Output High
DCI
Output current DC
offset too high
1.Restart inverter.
2.If error message still exists,contact Growatt.
Residual I
High
Leakage current
too high
1.Restart inverter.
2.If error message still exists, contact Growatt.
PV Voltage
High
The DC input voltage
is exceeding the
maximum tolerable
value.
Disconnect the DC switch immediately.
Auto Test
Failed
Auto test didn't
passed.
Contact power company
，
By they decide whether
to manually cancel.
10.2 Errors(E)
Errors(E) codes identify a possible equipment failure, fault or incorrect inverter
setting or configuration. Any and all attempts to correct or clear a fault must be
performed by qualified personnel. Typically, the (E) code can be cleared once the
cause or fault is removed. Some of the (E) codes, Error as indicated in the table
below, may indicate a fatal error and require you to contact the supplier or the
Growatt to replace a new one.
Error code
Description
Suggestion
Error: 101
Communication fault Slave
processor can't receive data
from Master processor.
1.Restart inverter
2.If error message still exists, contact Growatt.
Error: 102
Consistent fault. Data received
by Master and Slave processor
are different. The reason can be
utility grid voltage or frequency
change frequently.
1.Restart inverter.
2.If error message appears frequently or error
message still exists after replacement, check
utility grid. f you require help, contact Growatt.
3.If error message still exists, contact Growatt.
Error: 116
EEPROM fault
Contact Growatt.
Error: 117
Error: 118
Error: 119
Error: 120
Error: 121
Error: 122
Relay fault
Contact Growatt.
Contact Growatt.
Contact Growatt.
Init model fault
GFCI Device Damage
HCT fault
Communication fault.
Master processor can't
receive data from Slave
processor.
Bus voltage fault
Contact Growatt.
1.Restart the inverter
2.If error message still exists, contact
Growatt.
Contact Growatt.
Note
：
The latest 5 NS(Network and System) protection records can be read by
LCD or communication software. An interruption of
≤
3 Sec to the power supply
does not lead to any loss of fault records (according to VDE-AR-N 4105, cl.6.5.1).
Error: 111
PE abnormal
1.Check PE,to ensure that the PE line contact
good.
2.Check the L and the N line to ensure that they
are not reversed.
3.Restart inverter.
4.If error message still exisits,contact Growatt.
