Code 231-E170: Pos. error too large %1
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Pos. error too large %1 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] - Defect in the mounting of the position encoder - Incorrect thermal, linear or nonlinear compensation - Excessive backlash [Error correction] - Check the parameter value (maximum position deviation between MC and CC during operation) - Check the parameter value in CfgAxisComp->linearCompValue (linear axis error compensation for analog axes) - Check the parameter value in CfgAxisComp->backLashType1 (backlash compensation) - Check the mounting of the position encoder- 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 231-E170 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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