Code ARC-306: Start Height Adjust is ignored
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Start Height Adjust is ignored 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: Arc Start Height Adjust is ignored because of Single Step, Dry Run. Or because of Weld Disabled. If Lincoln welder is used, ArcLink may be disconnected. Remedy: Release Single Step or Dry Run or set Weld Enabled to perform Arc Start Height Adjust. If you want to perform Arc Start Height Adjust with Weld Disabled, set “Skip with Weld Disabled” item to FALSE on Arc Start Height Adjust setup screen. If you are using Lincoln welder, establish the ArcLink connection. If you do not want to display the warning message, set $AWSTHOF. $POST_WARN to FALSE.
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-306 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.
Have a better solution?
Help the industrial community by sharing your repair experience for code ARC-306.
Need a searchable reference for more Fanuc R-30i Series Robot Controller manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026