Fanuc Error Code and Repair Guides - 37 Guides
Fanuc industrial controls troubleshooting hub with 37 guides for fault codes, alarms, symptoms, parts checks, and repair decisions.
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".
Start With These Fanuc Guides
Fanuc FAQ
Where should I start with Fanuc error codes?
Start with the exact Fanuc model and displayed code or alarm, then open the closest guide on this page. Match the symptom, recent service history, and any secondary codes before resetting the equipment or ordering parts.
Do Fanuc fault codes always mean a bad control board?
No. Many Fanuc codes point to airflow, water flow, sensors, wiring, power quality, filters, switches, or operating conditions. Check the simple causes in the guide before replacing an expensive board.
When should I stop troubleshooting a Fanuc fault myself?
Fanuc industrial alarms can involve stored energy, moving machinery, high-voltage drives, servo systems, and production interlocks. Stop and use the repair checklist or compare service options when the guide points to line voltage, machine guarding, stored energy, safety circuits, or repeated faults after a reset.
| Error Code | What It Means | Guide |
|---|---|---|
| 400 Servo Alarm Fanuc | SV0400 Overload Checks | Fix → |
| Doosan CNC Alarm Codes Guide | Fanuc and i Series Controls | Fix → |
| Fanuc 30i, 31i, and 32i Alarm Codes | Fanuc 30i/31i/32i guide for I/O link, servo, spindle, SRAM, PMC, battery, encoder, and machine-builder alarm diagnostics. | Fix → |
| Fanuc Alarm 506 | Servo Following Error Fix | Fix → |
| Fanuc Alarm 90 | Causes & Fix | Fix → |
| Fanuc P/S Alarm Program and Syntax Codes | Fanuc P/S alarm guide for program syntax errors, alarm numbers, faulted blocks, G-code mistakes, macro issues, and safe edit checks. | Fix → |
| Fanuc vs Mazak CNC Controls | Fanuc vs Mazak CNC controls compared for alarm lookup, operator workflow, service access, parts support, and troubleshooting decisions. | Fix → |
| Fanuc Alarm 300 APC Battery Low | Fanuc alarm 300 guide for APC battery low faults, absolute encoder battery replacement, backup timing, home-position risk, and recovery. | Fix → |
| Fanuc Alarm 409 | Servo Overload (Z-Axis) | Fix → |
| Fanuc Alarm 800: APC Alarm | Causes and Fix | Fix → |
| Fanuc Alarm 750 | Causes & Fix | Fix → |
| Fanuc Alarm 300 APC Absolute Encoder | Fanuc alarm 300 guide for APC absolute encoder faults, backup batteries, pulse coder initialization, axis zero return, and board diagnosis. | Fix → |
| Fanuc M-Series Control Alarm Codes: Complete Guide | Fanuc M-Series CNC control alarm codes and diagnostics. Servo, spindle, PMC, and system alarms with causes and technician-level fixes. | Fix → |
| Fanuc 0i-MD Alarm Code Reference | Fanuc 0i-MD CNC guide for program, PMC, servo, spindle, overtravel, SRAM, pulse-coder, and emergency-stop alarms. | Fix → |
| Fanuc Alarm 1 Overtravel | Causes & Fix | Fix → |
| Fanuc Alarm 10 Servo Alarm | Causes & Fix | Fix → |
| Fanuc Alarm 2 | Overtravel Plus Causes & Fix | Fix → |
| Fanuc Alarm 3 | Overtravel Minus Hardware Causes & Fix | Fix → |
| Fanuc Alarm 360 | APC Alarm Battery Low Causes & Fix | Fix → |
| Fanuc Alarm 4 | Stored Stroke Limit Overtravel | Fix → |
| Fanuc Alarm 401 Servo Axis Overload | Fanuc alarm 401 means a servo axis overload. Check binding, lubrication, cutting load, motor thermistors, servo amp current, and parameter settings. | Fix → |
| Fanuc Alarm 411 | Causes & Fix | Fix → |
| Fanuc Alarm 414 | Servo Axis Following Error Fix | Fix → |
| Fanuc Alarm 424 | Causes & Fix | Fix → |
| Fanuc Alarm 435 | Causes & Fix | Fix → |
| Fanuc Alarm 436 | Causes & Fix | Fix → |
| Fanuc Alarm 437 | Servo Following Error 4th Axis Causes & Fix | Fix → |
| Fanuc Alarm 460 | Spindle Overload | Fix → |
| Fanuc Alarm 460: Spindle Speed Error | Detailed Troubleshooting | Fix → |
| Fanuc Alarm 5 | Stored Stroke Limit 2 Overtravel | Fix → |
| Fanuc Alarm 500 | Causes & Fix | Fix → |
| Fanuc Alarm 6 Overtravel | Causes & Fix | Fix → |
| Fanuc Alarm 600 | Causes & Fix | Fix → |
| Fanuc Alarm 700 | Causes & Fix | Fix → |
| Fanuc Alarm 700 Spindle Overheat | Detailed Fix Guide | Fix → |
| Fanuc CNC Alarm Codes | Complete Reference | Fix → |
| Fanuc OT Alarm Software Overtravel | Fanuc soft OT alarm guide for software overtravel, axis recovery, stroke-limit parameters, reference return, and repeat overtravel causes. | Fix → |