Code 280-04C9: Slot smaller than stylus tip
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Slot smaller than stylus tip 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] The diameter of the stylus tip is greater than the width of the slot to be measured. For the STYLUS L-TYPE, the diameter of the stylus tip plus center offset is greater than the width of the slot to be measured. [Error correction] Use a smaller stylus tip to measure this slot. For the STYLUS L-TYPE, use a smaller center offset to measure this slot. [920] 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 280-04C9 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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