E.CPU

CPU error

Mitsubishi Electric · A500 Inverter

What does E.CPU mean?

The inverter self-determines a CPU error and stops output if the arithmetic operation of the built-in CPU does not complete within a predetermined period. This typically indicates an internal processor malfunction or a severe software execution issue.

Common Causes

  • Internal error detected by the main processor (CPU) of the control unit.
  • Corrupted firmware or operating system data.
  • Hardware failure on the main control board.
  • Overheating of the CPU leading to instability.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure all internal connections and modules within the inverter are securely fitted.

Browse all codes in this manual (21)
Verified technical data. Last updated: March 2026

Related Faults

Source: Mitsubishi Electric A500 Inverter