Code 280-04C0: Preset cannot be modified after probe objects have been
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Preset cannot be modified after probe objects have been 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
probed [Cause of error] The modifications to the preset are not possible. Modifications to the preset are only possible as long as no object has been probed yet. [Error correction] Discard objects that have already been probed by ending the manually selected probing function. Then you can make the changes to the preset.
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 280-04C0 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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