Code 231-C380: Motor %1 not controllable
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Motor %1 not controllable 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] - Motor encoder cable defective - Motor defective - I2t monitoring has responded - Signal connector: Poor contact or penetration of humidity - Humidity has entered the motor - Motor brake is on [Error correction] - Check the motor cabling - Inform your service agency - Check the motor and the motor encoder cabling - Check the motor table entry - Check I2t monitoring
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-C380 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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