| Error No. | Explanation | Corrective measures |
| 3504 | The insulation monitoring device has detected an insulation error. Since the parameter IsoErrIgn is set to On, this error is ignored. | • Check the PV array for ground faults. |
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- Error Code - 204 - Grid voltage too low
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- Error Code - 205 - Phase Drop Out
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- Error Code - 502 - Power frequency low
- Error Code - 503 - Power frequency too high
- Error Code - 504 - Power frequency too low
- Error Code - 505 - Power Frequency is too high
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