Code 1802: LLEGAL STARTUP CONDITION G12.1
Issue Description & Safety Warning
The Mazak Mazatrol Matrix CNC has triggered a critical LLEGAL STARTUP CONDITION G12.1 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., BNo. Cause: 1. The G12.1 command is set when the current position of the No. 1 axis (linear axis) on the plane is present on the negative side. 2. The No. 2 axis (rotational axis) on the plane is not a rotating type of rotational axis. Action: 1. Move the current position of the No. 1 axis (linear axis) on the plane into the positive side before setting the G12.1 command. 2. Specify a rotating type of rotational axis as the No. 2 axis on the plane. Example: G17X_C_; G12.1; …
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 1802 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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