Code 1991: NOT POSSIBLE CROSS MACHINING
Issue Description & Safety Warning
The Mazak Mazatrol Matrix CNC has triggered a critical NOT POSSIBLE CROSS MACHINING 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
Type of error: B — Registered data (the program or tool data includes an error) Stopped status: I — Reset stop Clearing procedure: O — Eliminate cause -> press reset key Display colour: Red On-screen parameters (shown in parentheses): WNo., NNo., Cause Cause: During the tool path check, the system in which the crossing command was set and/or the remote system for which the crossing command was to be executed has been set to the following status: 1: The specified axis does not exist in the remote system. 2: The local system is specified as the system for which the crossing command was to be executed. 4: A crossing control command is set for the axis currently undergoing the crossing command. 16: The G110 command is set when the local system/remote system is in the modal environment that does not allow crossing control. 32: The crossing control command is set under the prohibited status of recalculation. Action: Review and correct the program.
Source: Mazak Mazatrol Matrix — Parameter List, M-Codes, Alarm Manual (Section 3 Alarm)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Mazak Mazatrol Matrix CNC Alarms
Mazak controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 1991 on the Mazatrol Matrix CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Mazak's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 714 Mazak Mazatrol Matrix CNC codes.
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