WATCHDOG_ALARM_3

Watchdog Alarm 3 Issued

Fanuc · αi 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

  1. 1

    Turn the power off, then back on

  2. 2

    If this alarm recurs, replace the servo amplifier module

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Verified technical data. Last updated: March 2026
Source: Fanuc αi series AC Servo Motor