CNC Equipment Troubleshooting by Control and Alarm Type
Use this CNC equipment hub when the machine is down and the alarm has to be sorted by system: servo axis, spindle, ATC, control, cabinet power, or I/O. The related CNC error code index is best when you already know the exact alarm number.
Start with the control brand, then narrow the fault to the hardware area below. This keeps the repair path focused before replacing a drive, encoder, cable, board, or tool changer sensor.
136
CNC Guides
8
Control Families
Start by Control Brand
Troubleshoot by Machine Area
| Machine Area | Common Signals | First Checks | Parts |
|---|---|---|---|
| Servo and axis faults | Following error, overtravel, encoder loss, axis drift | Inspect encoder feedback, servo drive alarms, brake release, axis binding, and parameters. | Check |
| Spindle faults | Speed deviation, overload, orientation failure | Check spindle drive status, belts, encoder feedback, cooling, motor insulation, and load. | Check |
| ATC and tool changer faults | Tool clamp alarm, carousel position fault, arm timeout | Confirm clamp switches, proximity sensors, air pressure, magazine alignment, and sequence state. | Check |
| Control and I/O faults | Battery, memory, fieldbus, I/O, or cabinet alarms | Verify control battery, cabinet power, I/O modules, safety chain, and communication cabling. | Check |
CNC Repair Guides
| Guide | Description | Open |
|---|---|---|
| Cincinnati CNC Fault Codes — Complete Troubleshooting Guide | Cincinnati Milacron and Cincinnati Machine fault codes for Maxim, Arrow, and Sabre series. What each code means and how to fix it. | Open |
| CNC Alarm Reset Guide: Clear Alarms Safely | CNC alarm reset guide for Haas, Fanuc, Mazak, DMG Mori, and Siemens machines covering overtravel, servo, spindle, ATC, lube, and hydraulic faults. | Open |
| CNC Machine Error Codes: Complete Troubleshooting Guide | CNC machine error codes explained across Fanuc, Haas, Mazak, Siemens, Okuma, and Mitsubishi controls with common alarm categories and fix steps. | Open |
| DMG Mori DMF Series Fault Codes | DMG Mori DMF guide for spindle, servo, lubrication, hydraulic, ATC, coolant, thermal-control, and Siemens or Heidenhain alarms. | Open |
| DMG Mori CNC Fault Codes Guide — CELOS / Siemens 840D | DMG Mori CNC machine fault codes for CELOS and Siemens 840D SL controls: alarm descriptions, servo and spindle faults, and troubleshooting steps. | Open |
| Doosan CNC Fault Codes - PUMA, LYNX, DNM, DVF | Doosan CNC alarm guide for PUMA, LYNX, DNM, and DVF machines: Fanuc alarms, PMC messages, turret faults, hydraulics, ATC, and spindle checks. | Open |
| Fanuc 0i-MD Alarm Code Reference | Fanuc 0i-MD CNC guide for program, PMC, servo, spindle, overtravel, SRAM, pulse-coder, and emergency-stop alarms. | Open |
| 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. | Open |
| Fanuc Alarm 1 Overtravel — Causes & Fix | Fanuc alarm 1 overtravel guide for OT release, jogging off the limit, work offsets, soft limits, limit switches, and safe recovery. | Open |
| Fanuc Alarm 10 Servo Alarm — Causes & Fix | Troubleshoot Fanuc alarm 10 on CNC equipment with checks for servo load, spindle drives, parameters, wiring, and when to call a controls tech. | Open |
| Fanuc Alarm 2 — Overtravel Plus Causes & Fix | Diagnose Fanuc Alarm 2 - Overtravel Plus Causes & Fix: what triggers the alarm, checks to run, and repair decisions before clearing the machine. | Open |
| Fanuc Alarm 3 — Overtravel Minus Hardware Causes & Fix | Diagnose Fanuc Alarm 3 - Overtravel Minus Hardware Causes & Fix: what triggers the alarm, checks to run, and repair decisions before clearing the machine. | Open |