Code P201-000: Program error (MRC)
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Program error (MRC) 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 subprogram, called with a compound type fixed cycle for turning machining I command, has at least one of the following commands: reference position retu rn command (G27, G28, G2 9, G30); thread cutting (G33, G34); fixed cycle ski p-function (G31, G31.n). An arc command was found in the first movement block of the finished shape program in compound type fixed cycle for turn ing machining I. Remedy Delete G27, G28, G29, G30, G31, G33, G34, and fixed cycle G codes from the subprogram called with the compound type fixed cycle for turning machining I commands (G70 to G73). Delete G02 and G03 from the first mo vement block of the finished shape program in compound type fixed cycle for turning machining I.
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 P201-000 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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