Code P29-000: Not accept command
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Not accept command 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 command has been issued when it is impossible. The normal line control command (G40.1, G41.1, G42.1) has been issued during the modal in which the normal line control is not acceptable. The command has been issued during the modal in which the two-part syst em simultaneous thread cutting is not acceptable. A workpiece coordinate syst em preset command (G92.1) has been issued during tool length compensa- tion, nose R compensation or tool radius compensation. Remedy Correct the program.
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 P29-000 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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