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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.

Option Fault

Option alarm

Mitsubishi Electric · FR-E500 Inverter

What does Option Fault mean?

The inverter output is stopped due to an internal connector fault within an optional device connected to the inverter. This indicates a communication or connection issue with an installed option card or module.

Common Causes

  • Loose or improperly seated internal connector for an optional device.
  • Faulty optional device or its internal circuitry.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power cycle the inverter (turn off, wait, turn on).

  2. 2

    Ensure all optional boards or modules are securely seated in their connectors within the inverter.

  3. 3

    If the fault persists, contact a sales representative for diagnosis and potential replacement of the optional device or inverter.

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

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Source: Mitsubishi Electric FR-E500 Inverter
Open Manual (Page 147)Search more codes in this manual