The Ultimate CNC Alarm Codes Encyclopedia (2026): Fanuc, Haas, Siemens, Mitsubishi — Real Fixes, Root Causes, and Professional Troubleshooting Guide

CNC alarm messages stop production instantly. When alarms appear operators search online immediately looking for solutions that explain not only what happened but how to fix it safely.

This encyclopedia gathers the most common CNC alarms used worldwide and explains real production causes and professional solutions.

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Fanuc Alarm 500 — Servo Overload
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Common causes:

• Axis obstruction.
• Dry lubrication.
• Excessive acceleration.

Real fix:

Check way lubrication system first before servo reset.

Many shops replace motors unnecessarily.

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Fanuc Alarm 414 — Overtravel
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Machine exceeded travel limits.

Typical causes:

Wrong work offset.

Restart in incremental mode.

Solution:

Verify G54 values.

Return axis manually.

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Haas Alarm 103 — Overload
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Heavy cutting engagement.

Chip evacuation failure common cause.

Reduce engagement width.

Increase coolant pressure.

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Siemens Servo Alarm
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Often related to drive tuning.

Check axis load graph.

Mechanical binding frequently ignored.

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Spindle Overheat Alarm
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Blocked cooling.

Warm-up cycle skipped.

Professional shops warm spindle gradually.

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Emergency Stop Without Alarm
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Often electrical safety circuit.

Door interlock or vibration detection.

Check wiring before assuming control fault.

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Why This Encyclopedia Works
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Operators search alarms daily.

Bookmarkable troubleshooting references generate long-term traffic.

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Final Takeaway
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Alarms protect machines.

Understanding root causes protects production.