| Error No. | Explanation | Corrective measures |
| 801 | One line conductor of the utility grid has failed. | • Check the line voltage. • Make sure the external fuses function properly. • Make sure the AC cable connections are securely connected |
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- Error Code - 502 - Power frequency low
- Error Code - 503 - Power frequency too high
- Error Code - 504 - Power frequency too low
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