Fanuc 414 Servo Alarm Z Axis Detect Error May 2026

A Fanuc 414 Servo Alarm (Z Axis Detect Error) indicates that the CNC has detected an abnormal current or a hardware fault within the digital servo system specifically for the Z axis. This is a critical error often caused by a short circuit, a faulty amplifier, or a motor failure. Immediate Diagnostics

• Solid green = normal
• Red flash code = specific fault (e.g., 1 flash = overcurrent, 2 flashes = DC link undervoltage)

. This alarm is often triggered by the CNC when it detects a high current or "detection system error" originating from the servo amplifier or feedback system. TIE Industrial Fanucworld Primary Causes for Z-Axis 414 Alarm High Current/Short Circuit: Often indicated by an 8, 9, or A fanuc 414 servo alarm z axis detect error

• Servo Amplifier: The servo drive module may have a blown transistor or logic fault. If the drive is unable to switch the current to move the motor, the motor stops, but the control still expects motion.
• Motor Brakes: The Z-axis has an electromagnetic brake to hold the spindle when the machine is turned off or stopped. If this brake fails to disengage when the servo powers up, the motor tries to turn against a locked brake. This results in an immediate overload and detection error.

Following the cable down to the Z-axis motor, he found the issue: coolant ingress. Cutting fluid had leaked into the motor connector, creating a conductive bridge that was literally zapping the system every time it tried to move. 4. The Resolution A Fanuc 414 Servo Alarm (Z Axis Detect