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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.

254

Invalid Function Code or Mode

Fanuc · Alpha i series AC Servo Motor

What does 254 mean?

An invalid function code or mode has been specified, preventing the system from performing the requested operation. This could be due to an incorrect command or an unsuitable operating mode.

Common Causes

  • Invalid function code specified.
  • Invalid operating mode selected.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the command code specified with a function code.

  2. 2

    Verify the currently selected operating mode.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

000Power-Down Required Parameter011Zero Feedrate Specified013Maximum Feedrate Zero
Source: Fanuc Alpha i series AC Servo Motor
Open Manual (Page 223)Search more codes in this manual