Code WNDW-025: Echo window for read not act
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Echo window for read not act 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: A READ_KB call was executed where the specified file is opened to a window that is not attached to the active screen and the terminate mask included the no_window bit Remedy: This may be a normal result if the user intended READ_KB requests to fail if the required window is not displayed. Otherwise, either modify the terminate mask or use ATT_WINDOW_D or ATT_WINDOW_S to attach the required window.
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 WNDW-025 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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