Alarm ID | Alarm Name | Alarm Severity | Possible Cause | Suggestion |
400 | System Fault | Major | Cause ID = 1/3/21/23/27 An unrecoverable fault occurs on a circuit inside the SUN2000. | Turn off the AC output switch and DC input switch. Then turn on the AC output switch and DC input switch after 5 minutes. If the fault persists, contact Huawei technical support. |