Fault code

Inovance MD280 Err21 EEPROM read-write fault

Diagnostic context

What Err21 means on Inovance MD280

Err21 is the MD280 eeprom read-write fault. The manufacturer associates this fault with the EEPROM chip is damaged.

Operating context: Start with the manufacturer troubleshooting step: Replace the main control board.

This diagnostic context is an editorial explanation. The possible causes and recommended checks below are the verified manufacturer troubleshooting content.

Possible causes

  • The EEPROM chip is damaged.

Recommended checks and actions

  • Replace the main control board.

Technical source

Inovance MD280 User Manual EN - Err21 troubleshooting — page 162

Inovance MD280 troubleshooting VI - Err21 — page 11