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Table 8-5 LCD Troubleshooting FAULT
Fault Description / Instruction
Fault0020
(Bus over volt
Hardware)
1. Restart inverter by turning both AC and DC
switches OFF. Wait for 1 minute for all energy to
discharge and turn both switches ON
2. If inverter cannot clear fault, replace inverter
1. Restart inverter by turning both AC and DC
switches OFF. Wait for 1 minute for all energy to
discharge and turn both switches ON
2. If inverter cannot clear fault, replace Control
Board or inverter
Fault0080
(Bus Hardware over
current fault)
1. Restart inverter by turning both AC and DC
switches OFF. Wait for 1 minute for all energy to
discharge and turn both switches ON
2. If inverter cannot clear fault, replace inverter
Fault0090
(Dynamic leakage
current high)
Check wires of PV and ground:
1. Turn OFF AC switch to disconnect inverter from
grid
2. Open fuse holders to isolate PV strings. Test
strings with meter
3. Add one PV string and start inverter to see if
alarm occurs.
3. If no alarm, turn OFF AC switches to disconnect
from grid and add in the next string. Start inverter
again.
4. Continue until the string that triggers the alarm is
identified. Trace back the faulted string to find any
leakage to Earth Ground.
Fault0100
(Grid relay fault)
1. Restart inverter by turning both AC and DC
switches OFF. Wait for 1 minute for all energy to
discharge and turn both switches ON
2. If inverter cannot clear fault, replace inverter
Fault0110
(Bus imbalance)
1. Raise limit of IDCmax (for example, 400mA) to
allow inverter more room to adjust in transient
condition to cope with imbalance of impedance
and voltage between grid phases
2. If after adjustment, alarm still occurs, replace
inverter
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