Code V04-0001: Safety observation & Smart both ON
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Safety observation & Smart both ON 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
Details The system has both an axis for which Safety observ ation is enabled (the parameter "#2313 SV113(SSF8)/ bitF" or "#13229 SP229(SFNC9)/bitF" is "1") and an axis for which Smart safety observation is enabled (the parameter "#51101 SF_Disable" or "#51301 SF_SDisable" is "0"). Remedy Disable Safety observation for all the axes (Set t he parameters "#2313 SV113(SSF8)/bitF" and "#13229 SP229(SFNC9)/bitF" to "0"), and turn ON the NC reset signal. Disable Smart safety observation for all the axes (Set the parameters "#511 01 SF_Disable" and "#51301 SF_SDisable" to "1"), and turn the power OFF and ON.
Source: Mitsubishi M800/M80/E80 Series Alarm/Parameter Manual (IB-1501279)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mitsubishi M800/M80 CNC Alarms
Mitsubishi controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code V04-0001 on the M800/M80 CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mitsubishi's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 722 Mitsubishi M800/M80 CNC codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code V04-0001.
Need a searchable reference for more Mitsubishi M800/M80 CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026