Code UFB-413: Firmware Err
Issue Description & Safety Warning
The Allen-Bradley PowerFlex 750 Drive has triggered a critical Firmware Err 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
Type: Configurable Either P9 [FB0 Loss Cfg] or P39 [FB1 Loss Cfg] Indicates that there is a Firmware Error on the Feedback Option module. A Firmware Error occurs if the Hardware and the downloaded Firmware are not compatible. This error could also indicate that communication between the Feedback Option module and the Main Control Board was interrupted during power-up. Cycle power to clear this fault.
Source: Allen-Bradley PowerFlex 750-Series AC Drives Programming Manual (750-PM001)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Allen-Bradley PowerFlex 750 Drive Alarms
Allen-Bradley controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code UFB-413 on the PowerFlex 750 Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Allen-Bradley's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 663 Allen-Bradley PowerFlex 750 Drive codes.
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