This FANUC alarm code list should help you properly diagnose your CNC error message.
What Is a FANUC Alarm Code?
A FANUC alarm code—also known as a fault or error code—is how a CNC system signals that something isn’t operating correctly. These codes appear on the control panel and point to electrical, mechanical, or program-related issues. Whether it’s a syntax error in your program or a drive overload, the alarm code helps pinpoint the underlying problem.
Common FANUC Alarm Codes and What They Mean
Here’s a curated list of frequently encountered FANUC alarm codes and their meanings across different systems like CNC controls, servo amplifiers, spindle drives, and system boards:
| Alarm Code | Description | Applies To |
|---|---|---|
| 1 | Motor overheat — spindle or motor inside is above temperature limit | AC Serial Spindle Drives |
| 33 | Insufficient DC link charging — power supply isn’t fully charging | AC Serial Spindle Drives |
| 8, 9, A | Abnormal (high) current detected on corresponding axis | Alpha i Servo Amplifier |
| 5 | DCOH: excessive regenerative discharge | AC Servo Amplifier |
| 368, 369 | Firmware requires update | Beta / Alpha Amplifiers |
| 910–914 | Parity errors in RAM modules (SRAM/DRAM) | CNC System Boards |
| 920, 921 | Servo amplifier watchdog or parity errors for specific axis cards | CNC System Boards |
| 930 | CPU interrupt fault | CNC System Boards |
| 401-409, 438-449 | Encoder, servo detection, spindle communication, and inverter high current | Drive / Amplifier Alarms |
Use the list below to interpret what exactly the fault code is trying to communicate. If you require a replacement part, know that CIT stocks thousands of FANUC CNC replacements. Get your new FANUC servo amplifier or check out our FANUC servo motors. To order a replacement part or a repair job, email [email protected].
CIT Service
If your CNC displays a Fanuc Spindle Drive Alarm 01, CIT can deliver fast, reliable repair services for your faulty spindle drive or you can purchase a newly refurbished unit.
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