Code SRVO-248: Deadman switch status abnormal
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Deadman switch status abnormal 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: The status of two DIs of DEADMAN switch do not match. Remedy: 1. Release both deadman switches at once. If SRVO-236 Chain failure is repaired occurred, there is no hardware problem. This alarm could occur when deadman switch is pressed halfway. 2. When SRVO-236 does not occur, please replace hardware in following order. - Teach pendant - Cable between teach pendant and panel board - Panel board - Cable between panel board and main board 3. After measures, the release operation of chain abnormal state is necessary. • The emergency stop button on the teach pendant or operator panel is pressed once, and released. • F4 'RES_1CH' is pressed on the Alarm Active screen. • The reset button is pressed.
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 SRVO-248 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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