Code TPIF-166: FWD/BWD in left window only
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical FWD/BWD in left window only 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: When the focus is in the right hand window of the teach pendant, you cannot execute the program. Remedy: Press DISP to change the focus to the left hand window. Use DISPLAY menu item EDIT <--> EDIT to swap the right hand program with the left hand 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 TPIF-166 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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