ST300 Series | E21, what does this message mean, and what can be done?

If the error message E21 appears on the frequency converter display, it indicates an EEPROM error.

Causes:
Error reading/writing control parameters.
The EEPROM is damaged.

Solutions:
Press STOP/RST to reset.
If the error occurs again, contact support and have the main control board replaced.

If none of these causes apply, please contact technical support.

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