Code 235207: <location>TM: Temperature fault/alarm threshold exceeded
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>TM: Temperature fault/alarm 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: OFF2 (NONE, OFF1, OFF3) VECTOR: OFF2 (NONE, OFF1, OFF3) Acknowledge: IMMEDIATELY (POWER ON) Cause: The temperature measured using the temperature s ensing of the Terminal Module (TM) (r4105) has exceeded the threshold value to initiate this fault (p4102[1]) - or the temperature exceeded the alarm threshold (p4102[0]) for longer than the dead time in parameter p4103. Please note that this fault can only be initiated if the temperature evaluation was activated (p4100 = 2 for KTY sensor or p4100 = 1 for PTC sensor). Fault value (r0949, interpret decimal): The hundred thousands and ten thousands location specifies the component number of the TMxx where the fault occurred. Alarm: Please note that Fault F35207 only caus es the drive to be shut down if there is at least one BICO interconnection between the drive and TM31. Remedy: - allow the temperature sensor to cool down. - if required, set the fault response to NONE (p2100, p2101).
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 235207 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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