Decrypt Your Siemens NCU Error Codes

Enter the error code from your machine's 7-segment display to instantly decode what it means and get troubleshooting guidance.

Select System Type:

Current

SINUMERIK

840D / 840D sl / 810D Error Code Diagnostics

CNC machine control systems for machining centers, lathes, and multi-axis machines

Supported Control Units:

NCU 571.5NCU 572.5NCU 573.5CCU
Error Code Format:0-9, A-F (hexadecimal)

SINAMICS

S120 Fault Code & LED Diagnostics

Modular drive systems for servo and vector applications

Supported Control Units:

CU320-2 DPCU320-2 PNCU310-2 DPCU310-2 PN
Error Code Format:Fxxxxx (Fault) / Axxxxx (Alarm)

Input Controls

Dot Status

7-Segment Display

Click LEDs to cycle through states

Note: 3 supported models (840D, 840D sl, 810D) share the same diagnostic manual (6FC5297) and use compatible error codes.

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NCU.info

What this tool does: This diagnostic tool helps CNC machine operators, maintenance technicians, and industrial engineers quickly understand and fix errors displayed on Siemens SINUMERIK 840D and 810D NCU/CCU modules.

How to use: Locate the hexadecimal error code (0-9, A-F) displayed on your NCU or CCU 7-segment display. Enter it above to get instant diagnostic information, troubleshooting steps, and replacement part numbers.

Supported systems: SINUMERIK 840D, 840D sl (NCU modules) and SINUMERIK 810D (CCU modules). All systems use the same diagnostic codes as documented in Siemens diagnostic manual 6FC5297.

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Data derived from Official SINUMERIK Diagnostics Manual (6FC5297). Check Error Codes in Official Manual

Not affiliated with Siemens AG. Independent diagnostic aid.