Code SPOT-042: Stud Welder Time Out Fault
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Stud Welder Time Out Fault 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
Cause: The robot detected a Stud Welder Time Out Fault from the current controller during a weld. This fault occurs when the controller does not detect a completed weld or a bad weld after the timer times out. Usually means that the stud is welded to both the target and the gun. Remedy: Once the robot is paused, carefully pry the gun and the stud apart, then reset fault on weld controller and resume the program.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code SPOT-042 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
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