Code 249154: <location>Cooling system: Liquid leak is present
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>Cooling system: Liquid leak is present 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: A_INF, B_INF, S_INF, SERVO, VECTOR Reaction: OFF2 Acknowledge: IMMEDIATELY Cause: The liquid leakage monito ring function has responded. Caution: Before this fault is re-parameterized as an alarm, y ou must ensure that the drive is shut down if cooling water is lost. See also: r0267 (Cooling system status word) Remedy: - check the cooling system for leaks in the cooling circuit. - check the wiring of the input terminal (Ter minal Module) used to monitor leaking fluid. SINAMICS-Alarms Diagnostics Manual (DAsl), 03/2009
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 249154 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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