ST600s | Err.21, what does this message mean, what can be done?

If the error message Err.21 appears on the display of the frequency inverter, it is an EEPROM error.

Causes:

• R/W error occurred in the control parameters; EEPROM is damaged.

Solutions:

• Press STOP/RST to reset.
• Replace the main control board.

If none of these error sources apply, please contact technical support.

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