Code 234207: <location>VSM: Temperature fault threshold exceeded
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>VSM: Temperature fault threshold exceeded 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: %1 Drive object: All objects Reaction: A_INFEED: OFF2 (NONE, OFF1) SERVO: NONE VECTOR: NONE Acknowledge: IMMEDIATELY (POWER ON) Cause: The temperature (r3666) measured using the Voltage Sensing Module (VSM) has exceeded the threshold value (p3668). This fault can only be initiated if the temperature evaluation was activated (p3665 = 2 for a KTY sensor or p3665 = 1 for a PTC sensor). Fault value (r0949, interpret decimal): The hundred thousands and ten thousands position specifies the component number of the VSM where the fault occurred. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009 Remedy: - check the fan. - reduce the power.
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 234207 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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