Code ARC-108: Wire touching before TRS seq
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Wire touching before TRS seq 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: Wire has already touched to a work before Touch Retract Start sequence starts. Remedy: Check whether the torch is too close to the work at the arc start position. If this is too close, please fix the teaching point. When the wire stickout just after arc end point of previous arc weld is too long, this may occur. Then, please adjust a burnback schedule for arc end point of previous arc weld to make wire stickout proper.
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 ARC-108 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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