Okuma CNC technician diagnosing an Okuma lathe to troubleshoot CNC errors and alarms
OSP Control Systems

Okuma CNC Alarm Codes
& Error Messages

Find a structured index of Okuma CNC alarm codes and error messages used on Okuma OSP control systems. Use the category links below to open the full alarm lists (A, B, C, D and P), then click any code to view details, causes and troubleshooting steps.

Alarm A Active? Machine Not Starting?

This error may indicate a control system or PLC issue. If the machine cannot restart, immediate diagnostics are recommended.

  • OSP-P300 troubleshooting
  • Parameter & PLC diagnostics
  • On-site repair
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Okuma Alarm Categories (A, B, C, D & P)

Okuma alarms are grouped by letter categories depending on their function in the CNC control. This page is the main navigation hub: choose a category to see the complete list of codes and open individual alarm pages for deeper explanations.

A Alarm A Full code list B Alarm B Full code list C Alarm C Full code list D Alarm D Full code list P Alarm P Full code list — PLC-related alarms
Okuma OSP CNC control panel showing a digital alarm code display used for diagnosing A, B, C, D and P series error codes OSP-P300 · digital alarm readout