Code 702802: Temperature monitoring, tool clamping hydraulics
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Temperature monitoring, tool clamping hydraulics 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
Temperature sensor on the tool clamping hydraulics unit has responded (signal state=0). The temperature of the hydraulic oil is too high. PLC input signal "Temperature monitoring, tool clamping hydraulics" is not registered. Feed Stop and Spindle Stop Unit is switched off. 1. Check the temperature on the tool clamping hydraulics unit. 2. Check the temperature sensor and the PLC input signal "Temperature monitoring, tool clamping hydraulics". 3. Check the actuation of the unit. It is possible that the ON / OFF switching is too short [leakage]. 4. Once the malfunction has been remedied, press [FEED START] key. Message is cleared.
Source: CHIRON Error Message Overview, all series (Siemens control, V2.0.6, 2012)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Chiron Siemens-Control CNC Alarms
Chiron controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 702802 on the Siemens-Control CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Chiron's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 545 Chiron Siemens-Control CNC codes.
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