Code 231-C370: Angle error motor encdr. %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Angle error motor encdr. %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] - Wrong commutation angle at reference position - Motor encoder defective - Motor encoder replaced - Cable of motor encoder defective - Signal connector: Poor contact or penetration of humidity - Humidity has penetrated the motor - CC controller unit is defective [Error correction] - Reset or check the commutation angle - Replace the encoder - Check motor encoder and leads - Exchange the CC controller unit - Inform your service agency 10/2023 [499]
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-C370 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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