Code 280-04B6: Basic rotation will be rescinded
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Basic rotation will be rescinded alarm.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] A basic rotation is in effect in the active preset. In order for the sequence to work correctly, the called probing cycle requires that this basic rotation be rescinded. [Error correction] Check your entries. Clear this message and press NC-START in order to rescind the basic rotation and continue with the probing cycle. Or perform an internal stop in order to cancel the probing cycle and check your entries.
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 280-04B6 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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