Code ER47: ILLEGAL OVERRIDE FUNCTION SETTING (TOO MANY PMC PATHS)
Issue Description & Safety Warning
The Fanuc 30i/31i/32i CNC has triggered a critical ILLEGAL OVERRIDE FUNCTION SETTING (TOO MANY PMC PATHS) 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
The “override mode” of the forced I/O function is available for up to three paths simultaneously. Make the “override mode” of the forced I/O function for several PMC paths and restart the CNC. The “override mode” of the forced I/O function is enabled for four or more PMC paths.
Source: Fanuc Series 30i/31i/32i-A Maintenance Manual, Appendix A Alarm List — PMC alarms (B-64485EN/01)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc 30i/31i/32i CNC Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code ER47 on the 30i/31i/32i CNC 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: 85 Fanuc 30i/31i/32i CNC codes.
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