Code 140-002B: Data file not saved
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Data file not saved 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] This warning is issued for information and appears if: - the configuration data have uncorrected syntax errors - or the configuration data were updated but the update was not yet saved - or default data were copied or a data backup was restored but the control was not yet restarted. In this condition, no configuration data are written to the data files. [Error correction] - Manually correct the fatal errors in the configuration editor by selecting the FIX SYNTAX ERROR soft key. - Fix the errors that are corrected by an update rule by selecting the CONFIG DATA soft key in the configuration editor and then saving. - Restart the control.
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 140-002B 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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