Code 4071: Check the position of the encoder
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Check the position of the encoder 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
Definitions: A machine data has been changed that affects t he value of an absolute encoder position. Please check the postion values. For absolute encoders: Encoder adjustment has been changed, the machi ne reference of the axis position may have changed, check the encoder adjustment. Other encoders: The reference point of the axis position has been changed, check the referencing procedure. Reaction: Alarm display. Remedy: Please inform the authorized personnel/service department. 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 4071 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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