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
Power cycle the inverter (turn off, wait, turn on).
- 2
Ensure all optional boards or modules are securely seated in their connectors within the inverter.
- 3
If the fault persists, contact a sales representative for diagnosis and potential replacement of the optional device or inverter.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric FR-E500 Inverter