Code 231-E01D: CC%2 SKERN Start requirement not fulfilled Id=%4, V=
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 SKERN Start requirement not fulfilled Id=%4, V= 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
%4 [Cause of error] - The requirements for starting cyclic operation are not fulfilled. [Error correction] - ID=1: Configuration was not successful. Check the additional information of the error messages E01A or E019. - ID=2: Check whether an error message E01E occurred. - ID=3: Your hardware version does not fulfill the requirements for safe operation. - Inform your service agency
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 231-E01D 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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