Code 230-00FE: Pos. SW limit switch is smaller than neg. SW limit switch
Issue Description & Safety Warning
The Heidenhain TNC Series CNC has triggered a critical Pos. SW limit switch is smaller than neg. SW limit switch 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
(%1) [Cause of error] The value of the positive SW limit switch is smaller than the value of the negative SW limit switch [Error correction] Check the parameter Axes->ParameterSets->????->CfgPositionLimits->... ”????” stands for the current parameter block name 10/2023 [307]
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 230-00FE 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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