Fanuc Error Code Reference — All 18 Codes
Complete Fanuc error code cheat sheet. All 18 fault codes with plain-English explanations and direct links to fix guides.
Use this page when your Fanuc drive, CNC, servo, or controls hardware posts an alarm during production. Start with the exact code, then open the fix guide for overloads, encoder faults, communication alarms, power quality issues, and drive or board failures.
Tip: search the exact brand, model, and alarm together, for example "Fanuc F0001" or "Fanuc overcurrent fault".
| Error Code | What It Means | Often a cheap fix? | Guide |
|---|---|---|---|
| Doosan CNC Alarm Codes Guide | Fanuc / Fanuc i Series Controls | — | Fix → |
| Fanuc 30i/31i/32i Alarm Code Guide | Complete Diagnostic Reference | — | Fix → |
| Fanuc Alarm 300 | APC Alarm Fix (Absolute Encoder) | — | Fix → |
| Fanuc Alarm 300: APC Battery Low | Absolute Encoder Battery Fix | — | Fix → |
| Fanuc Alarm 400 | Causes & Fix | — | Fix → |
| Fanuc Alarm 401 | Servo Axis Overload Fix | — | Fix → |
| Fanuc Alarm 409 | Servo Overload (Z-Axis) | — | Fix → |
| Fanuc Alarm 414 | Servo Axis Following Error Fix | — | Fix → |
| Fanuc Alarm 424 | Causes & Fix | — | Fix → |
| Fanuc Alarm 430 | Servo Motor Overheat Fix | — | Fix → |
| Fanuc Alarm 435 | Causes & Fix | — | Fix → |
| Fanuc Alarm 436 | Causes & Fix | — | Fix → |
| Fanuc Alarm 506 | Servo Following Error Fix | — | Fix → |
| Fanuc Alarm 700 Spindle Overheat | Detailed Fix Guide | — | Fix → |
| Fanuc Alarm 750 | Causes & Fix | — | Fix → |
| Fanuc CNC Alarm Codes | Complete Reference | — | Fix → |
| Fanuc OT Alarm | Software Overtravel (All Series) | — | Fix → |
| Fanuc P/S Alarm | Program and Syntax Error Codes Fix Guide | — | Fix → |