Code Y20-0012: Contactor operation abnormal
Issue Description & Safety Warning
The Mitsubishi M800/M80 CNC has triggered a critical Contactor operation abnormal 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 Contactor's operation is not following the NC's commands. Displays the No. of the abnormal cont actor for the contactor information. Remedy Check and correct "#1353 MC_ct1" (Contac tor shutoff output 1 device) setting. Check the wiring for contactor shutoff. Check for contac tor's welding. Restart the NC.
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 Y20-0012 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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