Code TOOL-012: Tool mastering data is lost.
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Tool mastering data is lost. 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: Mastering data of a servo tool was lost because of an unexpected stop during mastering of the tool. Remedy: 1. The tool pulse values and mastering data are lost. So, first move the tool by manual feed to cancel the “SRVO-075 Pulse not established” alarm. This alarm may not be occurring. If so, skip this step and proceed to the next step. 2. Next, carry out tool 0 position mastering and calibration manually.
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 TOOL-012 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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