Fanuc 414 Servo Alarm Z Axis Detect Error -

Displays servo interface status bits.

When the 414 alarm appears on the CNC screen, it is typically accompanied by a single-character code on the servo amplifier's LED display—most commonly . fanuc 414 servo alarm z axis detect error

Do not rely solely on the 414 master code. Navigate to the CNC diagnostic screen to view the precise bit data. Press the key on the FANUC MDI panel. Press the [DIAGN] softkey. Displays servo interface status bits

Open the electrical cabinet and locate the FANUC Servo Amplifier Module driving the Z-axis. Look at the single-digit LED status display on the front face of the drive. Navigate to the CNC diagnostic screen to view

Switch the feedback cables of the Z-axis and X-axis at the servo amplifier drive unit.

Alarm 414 is a blanket servo alarm. It tells you where the problem is (the Z-axis) and what system is complaining (the detection circuit), but it does not specify the exact root cause.

This error means the CNC detects abnormal current, position discrepancies, or feedback issues within the Z-axis drive system. It never triggers without a root cause. It usually pairs with a diagnostic screen code that pinpoints the exact failure. Step-by-Step Diagnostic Process 1. Check Diagnostic Monitor Screen Press the function key on your CNC panel. Select the DIAGN or DIAGNOSIS softkey. Navigate to parameter No. 200 or No. 204 . Note which bits (numbered 0 to 7) are set to "1". 2. Decode the Diagnostic Bits (Parameter 200/204)