WATCHDOG_ALARM_3

Watchdog Alarm 3 Issued

Fanuc · Alpha i series AC Servo Motor

What does WATCHDOG_ALARM_3 mean?

A watchdog alarm 3 was issued, indicating a system malfunction where the internal watchdog timer detected a deviation from expected operation. This is typically a severe internal error, pointing to a critical processor or software issue.

Common Causes

  • Internal system malfunction causing a watchdog timer error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn the power off, then back on

  2. 2

    If this alarm recurs, replace the servo amplifier module

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

Related Faults

Source: Fanuc Alpha i series AC Servo Motor