Code 702704: Safety: Test stop requested
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Safety: Test stop requested 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
Before opening the protective door, a safety test is required (test stop). After the test stop, the control is switched off. Error messages Safety technology Safety: Test stop requested Protective doors cannot be unlocked. [TESTSTOP] key is flashing. 1. [JOG] mode. 2. [Feed correction switch] 100%. 3. Key-operated switch "Input“ position [0].. 4. Close protective doors, loading doors and the tool changer door. 5. Clamp clamping device, and deactivate, if necessary. 6. Press [TESTSTOP] key. Test stop is executed.
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 702704 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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