Error 121; Error 122; Error 104; Error 119 - Growatt 10000UE Troubleshooting Manual

Relay fault
There is something wrong with the relay or its relevant circuit. Restart the inverter, if the error
still exists, please contact Growatt service to replace the inverter.
 Error 121
Communication error, control board doesn't receive data from COM board over 5 seconds.
1. Please power off the inverter completely till there is nothing displayed on LCD and restart,
observe whether the warning is cleared.
2. If the warning is not cleared, please power off inverter and open the inverter cover to confirm
the signal cable between control board and COM board shown in Fig.3.1.1 is connected well.
3. If the error still exists, please refer Annex 2 to replace control board and COM board.
 Error 122
Bus voltage is too high.
1. Restart the inverter, and check whether the error still exists.
2. Turn off AC breaker, measure the voltage between PV+ to PV- by multi-meter and check whether
it is within DC voltage range. If it is higher than the Max allowed DC voltage 1000V, you need to
reduce the quantity of PV modules.
3. Update the firmware of control board to version 0D37 or above, and COM board to version 0C30
or above.
 Error 104
Model error
Update the firmware of control board to version 0D37 or above, and COM board to version 0C30
or above.
 Error 119
GFCI module check fails
Update the firmware of control board to version 0D37 or above, and COM board to version 0C30
or above.

III System Fault

 Auto Test Failed
The auto test cannot pass.
 Auto test function is only activated in model for Italy.
Please make sure the grid (voltage and frequency) is normal. Restart the inverter and redo it.
 PV Isolation Low
PV input insulation impedance is too low.
1. Please confirm whether the output of inverter is connected according to user manual.
2. Please provide the model value shown as Fig.2.3.2 or Fig.2.3.3 to Growatt service.
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