Code 250-F329: Monitoring task %1 cannot be displayed.
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Monitoring task %1 cannot be displayed. 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] Possible causes: - A monitoring task with fewer than four limits was entered in the machine configuration under Monitoring/CfgMonPreferences/monitoringTasks[] - The values of the limits of the entry in CfgMonComponent are not in ascending order. - No value is entered for CfgMonComponent/display. [Error correction] - Check and if necessary correct the machine configuration under Monitoring/CfgMonComponent, or - Select another monitoring task in the "MON Detail" tab
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 250-F329 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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