3405 — Moving base Runaway detection (occurred when the +/- encoder value changed beyond 10 mm in the absence of motion instruction.)
Canon Medical (Toshiba) CT error code, reported by the console error system (EMS).
What 3405 means
On Aquilion 16 and Aquilion RX and Aquilion ONE and Aquilion S16 and Asteion Super4 and Activion16 CT systems, status code 3405 indicates: Moving base Runaway detection (occurred when the +/- encoder value changed beyond 10 mm in the absence of motion instruction.). The code originates in the Gantry / rotation section of the console error system (EMS). Severity level error (Error condition).
Reported action: Couch error detected. Turn gantry off for 5 seconds and try again. If the problem persists call service engineer..
Reported by the Toshiba/Canon CT console error system (errmsg.eng / EMS error message table), shared across the Aquilion, Asteion and Activion CT platforms.
Full troubleshooting for 3405
The complete diagnosis, cause tree, and step-by-step remedy for the Gantry / rotation subsystem are documented in the FSELIB Canon Medical (Toshiba) service manual — re-authored, web-first, with real figures.
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Related Gantry / rotation codes
Related service procedures
Source: errmsg.eng — Toshiba/Canon CT console (EMS) error message table. Reference information re-authored by FSELIB — not a copy of the OEM manual.