Code 160-00DD: Check the depth sign
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Check the depth sign 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] The cycle can only be performed in the negative direction (Cycle 204: positive direction) because the configuration parameter displayDepthErr is set to "on". [Error correction] - Enter a negative depth (Cycle 204: positive depth) in order to perform the cycle - Set the configuration parameter displayDepthErr to "off" in order to perform the cycle in positive direction (Cycle 204: negative direction) - Enter the diameter in Cycle 240 as a negative value in order to perform the operation in the negative direction of the tool axis.
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 160-00DD 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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