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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.

CPU Fault

CPU error

Mitsubishi Electric · FR-E500 Inverter

What does CPU Fault mean?

The inverter's built-in CPU failed to complete an arithmetic operation within a predetermined timeframe, triggering an internal alarm and stopping the output. This indicates a critical internal processing error within the inverter.

Common Causes

  • Internal inverter hardware or software malfunction.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a power cycle by switching the inverter's power supply off, waiting for at least 10 seconds, and then switching it back on.

  2. 2

    If the fault persists after a power cycle, contact a sales representative for further diagnosis, as this indicates a potential internal hardware failure.

Browse all codes in this manual (17)
Verified technical data. Last updated: April 2026

Related Faults

Br. Cct. FaultBrake transistor alarm detectionCorrupt MemoryParameter storage device alarmE. LFOutput phase failure protection
Source: Mitsubishi Electric FR-E500 Inverter
Open Manual (Page 148)Search more codes in this manual