Code 120405: SINAMICS: Firmware update for DRIVE-CLiQ components is running.%nPlease wait for the fi rmware update to be completed!
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical SINAMICS: Firmware update for DRIVE-CLiQ components is running.%nPlease wait for the fi rmware update to be completed! 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: The firmware update is being executed for at least one DRIVE-CLiQ component. Reaction: Alarm display. Remedy: None required. Please wait for the firmware update to be completed. Completion of the firmware update is signaled by alarm 120406. Program Continuation: Internal
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 120405 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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