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Why is my Conext CL showing an alarm code: 8000 (AC Internal Error Service Alarm)

Customer is calling in to confirm an alarm code:8000 (AC Internal Error Service)

Product Line: 
Conext CL 18000NA Conext CL 25000NA Conext CL 20000E Conext CL 25000E

On site troubleshooting

Reset unit by turn off both AC and DC
If problem persists, reset the unit
Update firmware to latest version from SE Solar Website ensuring that Control Boot firmware is at lest v2.02.03

Grid current measured exceeds unit rating
Internal AC bus voltage too high
Difference between top or bottom AC bus voltage too high
AC bus voltage too low
AC voltage sensor measurement failure
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