Code 231-E032: CC%2 power supply unit not ready for operation
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC%2 power supply unit not ready for operation 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] - In the safety self-test, the supply unit does not indicate readiness for operation - The RDY.PS signal is inactive for one of the following reasons: - No release at the X70 connector of the supply unit - Short circuit of the KDR commutation reactor - Incorrect wiring of the KDR - Hardware defective [Error correction] - Check the wiring on the connector X70 - Check the KDR wiring - Exchange the hardware - Generate the service files and notify the Service Department 10/2023 [555]
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-E032 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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