425
Internal Agitation Fan Stopped
Fanuc · Alpha i series AC Servo Motor
What does 425 mean?
This alarm is issued when the fan motor built into the servo amplifier module, used for internal agitation, has failed. The fan motor is a consumable component, and its failure can lead to overheating of the servo amplifier if not addressed.
Common Causes
- Fan motor built into the servo amplifier module has failed
- Fan clogged with foreign matter
- Power connector of the fan is improperly connected
Repair Steps & Checklist
Click steps to track your progress.
- 1
Check that the fan is not clogged with foreign matter
- 2
Check that the power connector of the fan is connected properly
- 3
Replace the fan or the entire servo amplifier module
Verified technical data. Last updated: March 2026
Related Faults
Source: Fanuc Alpha i series AC Servo Motor