Code 231-C700: DQ-ALM: Line power failure %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical DQ-ALM: Line power failure %1 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] - A power phase failure was detected at the DRIVE-CLiQ regenerative module ALM. - Power voltage supply is disturbed. [Error correction] - Check the protective devices of the line power voltage supply. - Check the wiring of the line power voltage supply. - Inform your service agency 10/2023 [515]
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-C700 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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