Code FRCE-159: F/S sensor limit overflow (F:%d^1)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical F/S sensor limit overflow (F:%d^1) 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: An excessive load was put on the sensor head. Remedy: 1. Make sure that the value of 'Insert Force' in 'Basic Data' is not too large. If not, go to the next step. 2. Bad impedance parameters can cause vibration during force control. Increase the Mass value in the impedance parameters. 4.ERROR CODES B-83124EN-6/02
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 FRCE-159 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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