Code 701638: Tool loader not in home position
Issue Description & Safety Warning
The Chiron Siemens-Control CNC has triggered a critical Tool loader not in home 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
Loading or unloading the magazine with the tool loader was interrupted and the tool loader is not yet in home position. A tool is still in the tool loader, for example. This message generally serves only as information and doesn't limit all machine functions immediately. For some functions, it is a basic precondition that the tool loader be in the home position. 1. Switch to manual mode. 2. Press [TOOL CH HOME POS.] key. Error messages Background magazine Tool loader not in home position 3. Tool loader in home position means: Tool gripper in home position Tool gripper empty No data in the tool gripper The diagnostic overview of the sensor signals can be found under: Chapter 2.2 ‘Tool changer diagnostics menu’ on page 11
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 701638 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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