Fanuc CNC Error Codes - Fanuc Fault Codes

We’ve dedicated this article to Fanuc CNC error codes, or Fanuc alarm codes. We’ve provided the Fanuc fault code list in PDF format.

Fanuc CNC Error Code List

CNC machines are computer-controlled machines. Every movement of servo motors, rails and slides, hydraulic-pneumatic systems, turrets, and tool holders is entirely software-controlled. In addition, thanks to advanced sensor monitoring, it’s possible to inform the CNC operator about faults, overloads, and similar issues that may occur in these parts. The system processes the fault data it receives from the sensors, converts it into error codes, and informs the operator.

Download the Fanuc Alarm List

The Fanuc fault code list is in PDF format. You can view the PDF document with Adobe Reader. You can search within the downloaded document using the CTRL+F key combination. To download the alarm list, click one of the links below.

What Topics Do Fanuc Fault Codes Cover

Fanuc CNC error codes:

Fanuc control system alarms
Program error alarms
Absolute pulse coder (APC) alarm codes
Serial pulse coder (SPC) alarms
Servo alarm codes
Overtravel alarms
Overheating alarms
Rigid tapping error codes
Serial spindle fault codes

and other varieties. While some of these error codes are situations the CNC machine operator can resolve, some need to be resolved by the department supervisor, some by the engineer who wrote the G-code, and some can only be resolved by the CNC machine’s authorized service provider.

fanuc cnc machine control panel screen — A view of the Fanuc machine control panel

When the machine operator sees the alarm code in question, if they know the cause of the problem and how to solve it (for example, if they’ve encountered it before), they resolve it. They report the situation to the relevant department supervisor. If they don’t know the cause of the problem or how to fix it, they don’t intervene with the machine. They report the situation to the relevant department supervisor.

The relevant department supervisor resolves the problem or takes steps to have it resolved. They report the situation. In their report, they record the cause of the fault, how it was resolved, when the fault occurred, and when it was fixed and the machine resumed normal operation. These reports are examined at company review meetings, and necessary measures are discussed to prevent the problem from recurring or to minimize it.

The procedures described above are necessary steps for companies operating in a professional manner.

Alarm Code Structure

Fanuc error codes generally consist of a letter followed by numbers, indicating the source of the fault.

Servo Alarm Category

Servo alarms usually indicate overload or positioning errors in the axis motors.

Fast Fault Diagnosis

Knowing the error code list helps CNC operators quickly diagnose and respond to a fault.

Related Questions

Many different components of the machine, such as the servo motors, rails, and hydraulic system, are monitored separately. Each component having its own specific error codes allows the operator to quickly understand exactly which part the problem originates from.

Sensors instantly detect abnormal situations such as overloading or an unexpected movement. This data is converted into an error code and relayed to the operator, so the problem can be noticed and addressed before it grows.