Code 280-049A: A replacement tool is not available
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical A replacement tool is not available 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 programmed tool is locked or the tool life has expired and no replacement tool is available. [Error correction] Check the columns TL, RT, CUR_TIME, and TIME2 of the programmed tool. If you programmed a tool number then the replacement tool is defined in the column RT. If you are using a tool name then define the same name for the replacement tool. 10/2023 [909]
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 280-049A 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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