Code 231-8005: Oscilloscope signal not supported
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Oscilloscope signal not supported 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] - At least one of the selected signals of the internal oscilloscope is not supported with this controller unit (CC422) - The following signals are not supported by the controller unit: P mech., P elec., DSP debug, DC-link P, CC DIAG, I actual, actl. Id, Iq max, U noml, int. diag., motor A and motor B [Error correction] - Please do not select the following signals: - P mech. - P elec. - DSP debug - DC-link P - CC DIAG - I actual - Actl. Id - U nominal - int. Diag. - Motor A - Motor B - Max. Iq
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 231-8005 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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