Code P129-000: Hi-speed Hi-accuracy both ON
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Hi-speed Hi-accuracy 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 Both the high-accuracy control mode and high-speed machining mode are commanded simultaneously in a part system where the simultaneous use of the two modes is disabled. Remedy Correct the setting of "#8040 High-speed high-accuracy control-en abled part system". Or correct the ma- chining program so that the high-accuracy control mo de is not used together with high-speed machining mode.
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 P129-000 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.
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