Code 231-A810: CC limit switch %1-
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical CC limit switch %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] The permissible negative traverse range (machine parameter CfgAxParSafety/absLimitNeg) was exceeded. [Error correction] - Check the value of the negative software limit switch and correct it if necessary: Machine parameter CfgPositionLimits/swLimitSwitchNeg - Check the traverse direction of the axis and correct it if necessary: Machine parameters CfgAxisHardware/signCorrActualVal and CfgAxisHardware/signCorrNomVal and the DIR column from the motor table or machine parameter CfgServoMotor/motDir - Inform your service agency [468] 10/2023
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-A810 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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