Code 75025: [Channel %1: ] CLC: stopped because sensor head has been touched
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] CLC: stopped because sensor head has been touched 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
Parameters: %1 = Channel number Definitions: The collision monitor of the sensor tip has signaled "Sensor touched". A retraction motion to the upper limit of the posi tion offset ($MC_CLC_SENSOR_UPPER_LIMIT ) is started using the max available velocity and acce leration reserves. The feedrate override setting has no effect on this retraction motion. The path motion is stopped at the same time. Reaction: Alarm display. NC Stop on alarm. Remedy: The part program can be continued with NC start. T he overlaid motion then returns to the control distance. Program Continuation: Clear alarm with the Delete key or NC START.
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 75025 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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