Code 280-0439: Contradictory measuring points
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Contradictory measuring points 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 one of the probing cycles 400, 403 or 420, you defined a contradictory combination of measuring points and measuring axes. - The selection of measuring points in Cycle 430 results in division by 0. [Error correction] - For measuring axis = reference axis (Q272=1), the parameters Q264 and Q266 are defined at different values. - For measuring axis = minor axis (Q272=2), the parameters Q263 and Q265 are defined at different values. - For measuring axis = probe axis (Q272=3), the parameters Q263 and Q265 or Q264 and Q266 are defined at different values. - Select the measuring points so that they always have different coordinates in all axes.
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 280-0439 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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