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
Ensure all internal connections and modules within the inverter are securely fitted.
Verified technical data. Last updated: March 2026
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Source: Mitsubishi Electric A500 Inverter