Code 206908: <location>Braking Module internal shutdown due to overtemperature
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Braking Module internal shutdown due to overtemperature 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
Message value: Drive object: B_INF Reaction: OFF2 (OFF1) Acknowledge: IMMEDIATELY Cause: Shutdown of the Braking Module due to overtemper ature at the temperature sensor of the braking resistor for more than 60s. See also: r3688 (Digital Braking Module fault overtemperature) Remedy: - reduce the temperature at the sensor. - check the temperature sensor connection.
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 206908 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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