Code 231-8AE0: Drive enabling missing in axis %1 (signal: %4)
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Drive enabling missing in axis %1 (signal: %4) 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] - The switch-on procedure was canceled due to an existing error condition: 1 = Signal -ES.A (emergency stop MC) is active during switch-on (emergency stop might have been pressed during switchon) 2 = Signal -ES.A.HW (emergency stop MC, handwheel) is active during switch-on (emergency stop might have been pressed during switchon) 3 = Signal -ES.B (emergency stop CC) is active during switch-on (emergency stop might have been pressed during switchon) 4 = Signal -ES.B.HW (emergency stop CC, handwheel) is active during switch-on (emergency stop might have been pressed during switchon) 5 = Switch-on procedure not allowed because of a unacknowledged error 6 = Internal software error: addressed axis module/gate array does not exist 7 = Internal error signal -STO.B.CC.WD active during switchon 8 = Internal error signal -N0 active during switch-on 9 = Internal error signal PWM error active during switch-on [Error correction] - Check the emergency-stop wiring - 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 231-8AE0 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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