Code 702708: Safety: Test stop, switch operating mode selection switch to zero position
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Safety: Test stop, switch operating mode selection switch to zero position 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
The "test stop" function was started, but the key switch is not at Key-operated switch "Input“ position [0].. Test stop is not executed. 1. Press [RESET] key 2. Activate Key-operated switch "Input“ position [0].. 3. 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 702708 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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