Code 238-1015: UVR%2 overload in the +24V of the integrated power
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical UVR%2 overload in the +24V of the integrated power 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
supply unit [Cause of error] The current consumption of the 24 V consumers on the integrated power supply unit of the UVR exceeds the maximum permissible value. [Error correction] - Check the wiring of the +24 V (X76, X90) of the power supply unit integrated into the UVR - Check consumers on +24 V, and reduce as needed - Check the planning of the machine according to the technical manual of your inverter system - Check the configuration of CfgSupplyModule3xx/MP_ps24VMaxLoadCurr - 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 238-1015 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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