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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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: April 2026

Related Faults

E.1 to E.3Option faultE.BEBrake transistor alarm detectionE.ECTWire break detection
Source: Mitsubishi Electric A500 Inverter
Open Manual (Page 201)Search more codes in this manual