Code 280-0449: Function not permitted
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Function not permitted 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] You tried to use a feature that is not enabled on your TNC by the Feature Content Level (FCL) management. [Error correction] By default, FCL functions are locked after a software update. By entering the code number 65535 in the SIK menu, you can enable these functions for a certain period of time for test purposes. You can enable FCL functions permanently by purchasing and entering a code number. For more information, contact your machine tool builder or the control manufacturer.
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 280-0449 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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