What is an NCU error code?

NCU error codes are diagnostic codes displayed on the 7-segment display of Siemens SINUMERIK Numerical Control Units. These codes indicate system status, errors, or operational states of the CNC machine control system.

How do I find the error code on my NCU?

The error code is displayed on a 7-segment LED display located on the front of the NCU or CCU module. It shows a single hexadecimal character (0-9, A-F) and may include a decimal point that flashes or remains solid to indicate additional status information.

What is the difference between NCU and CCU?

NCU (Numerical Control Unit) is used in SINUMERIK 840D and 840D sl systems, while CCU (Compact Control Unit) is used in the 810D system. Both use the same diagnostic error codes and share the same diagnostic manual (6FC5297).

What should I do if I see an error code?

Enter the error code into this diagnostic tool to get the official meaning and troubleshooting steps. Follow the real-world fix recommendations, which may include checking connections, replacing components, or power cycling the system.