Code 270-0007: Error while accessing file %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Error while accessing file %1 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] An error occurred while accessing the indicated file: - The file is not ISO Latin-15 encoded and begins with a Byte Order Mark (BOM) - The file contains impermissible control characters, particularly the string 'NUL' - Reading of the file is not permissible - The file is to be deleted, but may not be written - The file is to be renamed, but may not be written - A previous access to the already open file failed - There are already too many open files in the file system - The file system does not permit the creation of any more files - The file system reports some other error [Error correction] - Check the encoding of the file, change it if necessary, and remove the Byte Order Mark - Check whether the file contains impermissible control characters and remove them - Check and adapt the access rights to this file if necessary - Check the status of the file system, and repair the file system if necessary [854] 10/2023
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 270-0007 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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