Fanuc 414 Servo Alarm Z Axis Detect Error -

Here’s where people get stuck:
Alarm 414 can occur without the axis moving at all.

How?

The Fanuc 414 Z-axis alarm is a critical signal from the machine that it has lost synchronization with reality. While intimidating, it is often caused by a finite list of culprits: a fatigued feedback cable, a failed counter-balance system, or a stuck brake. By understanding the role of the Z-axis as a vertical, gravity-loaded component, technicians can diagnose the root cause more efficiently. Proper diagnosis not only fixes the immediate problem but ensures the longevity of the machine's drive system, maintaining both production uptime and operator safety. fanuc 414 servo alarm z axis detect error

This is a technical deep-dive into the FANUC 414 Servo Alarm: Z-Axis Detect Error (often displayed as SV0414 or 414 on the CNC control).

This alarm is specific to FANUC servo systems (Series 0i, 16i, 18i, 21i, 30i, etc.). It indicates a disconnection or abnormal signal between the CNC controller and the Z-axis servo amplifier’s position coder (pulse coder / encoder). Here’s where people get stuck: Alarm 414 can

Below is a complete feature guide covering causes, diagnostics, step-by-step checks, and repair recommendations.

The "detect error" is a symptom. The cause lies in one of four domains: Electrical Power, Feedback, Mechanical, or Control. The "detect error" is a symptom