Code 330-004C: Op. state of MC not equal CC
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Op. state of MC not equal CC alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
[Cause of error] The automatic SLS, SOS, STO operating states of the MC and CC are compared cyclically. If the values remain unequal for longer than 500 ms, a Safe Stop 1 (SS1) is released. [Error correction] - Press CE to acknowledge the error message - Switch the machine off and on - Inform your service agency. - Check the software version
Source: HEIDENHAIN NC Error Messages — TNC7/640/620/320/128, CNC PILOT 640, MANUALplus 620 (10/2023)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Heidenhain TNC Series CNC Alarms
Heidenhain controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 330-004C on the TNC Series CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Heidenhain's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4497 Heidenhain TNC Series CNC codes.
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