Code 280-0612: Radius of replacement tool not suitable
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Radius of replacement tool not suitable 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] - During automatic exchange of a replacement tool (M101), the TNC did not find a suitable tool in the tool table. - The total radius R + DR of the replacement tool is greater and/or R2 + DR2 is less than the radius of the current tool when 3-D compensation is active. [Error correction] - Define a replacement tool with suitable radii. - Perhaps use M107 to deactivate monitoring of the tool radii.
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 280-0612 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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