Code 231-8064: AC powerfail
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical AC powerfail 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] An error occurred during the AC Fail process. The line voltage was intermittently interrupted. Possible causes: - Power failure - Dropout in line power - Defective protection of the line power supply - Check the wiring of the line power supply [Error correction] - Check the line power circuit breakers - Check the power supply wiring - Check the quality of the line voltage (possible dropouts) - Inform your service agency
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 231-8064 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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