CNC Machine Error Codes: Complete Guide

CNC machine alarms are the diagnostic backbone of every production floor. When a Fanuc, Haas, Mazak, Siemens, Okuma, or Mitsubishi control throws a code, it tells you exactly where the fault lives — before you open the electrical cabinet. The trick is knowing whether the alarm points to the control, the drive, the motor, or the machine mechanics.

This hub indexes all 135 CNC error code guides on this site. Use the brand sections below for your specific control, or browse the general CNC troubleshooting guides.

Most CNC alarms fall into one of these categories: servo alarms (axis overtravel, tracking error, encoder loss), spindle alarms (speed deviation, overload, sensor fault), ATC alarms (tool changer position or clamp faults), control alarms (battery, memory, parameter errors), and communication alarms (drive link, I/O link, fieldbus).

Tip: Search your exact alarm number and control brand, for example "Fanuc 401 servo alarm" or "Haas 133 spindle drive fault".

135

Total Guides

Control Brands

Common CNC Alarm Categories

Alarm Type	What It Means	Typical Fix
Servo alarms	Axis tracking error, overtravel, encoder loss	Check encoder cable, servo drive, mechanical binding
Spindle alarms	Spindle speed deviation, overload, sensor fault	Check spindle drive, belt, encoder, motor windings
ATC alarms	Tool changer position, clamp/unclamp fault	Check tool change sequence, proximity sensors, hydraulics
Control alarms	Battery low, memory error, parameter mismatch	Replace battery, reload parameters, check control board

Fanuc Error Codes (36 guides)

Guide	Description	Fix
Doosan CNC Alarm Codes Guide — Fanuc / Fanuc i Series Controls	Doosan CNC machine alarm codes for Puma, DNM, and Lynx series with Fanuc 0i and 31i controls: common alarms, causes, and troubleshooting steps.	Fix →
Fanuc 0i-MD Alarm Code Guide — Complete Diagnostic Reference	Complete guide to Fanuc 0i-MD CNC alarm codes, meanings, causes, and first-step troubleshooting procedures for machinists and maintenance teams.	Fix →
Fanuc 30i/31i/32i Alarm Code Guide — Complete Diagnostic Reference	Complete guide to Fanuc 30i, 31i, and 32i CNC alarm codes, meanings, causes, and first-step troubleshooting procedures.	Fix →
Fanuc Alarm 1 Overtravel — Causes & Fix	What Fanuc alarm 1 overtravel minus means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 10 Servo Alarm — Causes & Fix	What Fanuc alarm 10 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 2 — Overtravel Plus Causes & Fix	What Fanuc alarm 2 overtravel plus means, why it triggers, and how to clear it step by step.	Fix →
Fanuc Alarm 3 — Overtravel Minus Hardware Causes & Fix	What Fanuc alarm 3 overtravel minus means, why the hardware limit trips, and how to fix it step by step.	Fix →
Fanuc Alarm 300: APC Battery Low — Absolute Encoder Battery Fix	Fanuc Alarm 300 means the absolute encoder battery is low or dead. Replace the 3V lithium battery fast — a dead battery wipes home position and forces re-homing.	Fix →
Fanuc Alarm 300 — APC Alarm Fix (Absolute Encoder)	Fanuc Alarm 300 is an APC (Absolute Pulse Coder) alarm on the absolute encoder. This guide covers battery replacement, encoder initialization, and board-level diagnosis.	Fix →
Fanuc Alarm 360 — APC Alarm Battery Low Causes & Fix	What Fanuc alarm 360 means, why the absolute pulse coder battery alarm fires, and how to fix it step by step.	Fix →
Fanuc Alarm 4 — Stored Stroke Limit Overtravel	What Fanuc alarm 4 means, why a stored stroke limit overtravel occurs, and how to clear the alarm and recover the axis.	Fix →
Fanuc Alarm 400 — Causes & Fix	What Fanuc alarm 400 servo overload X-axis means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 401 — Servo Axis Overload Fix	Fanuc Alarm 401 is a servo axis overload — the drive detected excessive current or thermal buildup. This guide walks through mechanical, electrical, and parameter-based fixes.	Fix →
Fanuc Alarm 409 — Servo Overload (Z-Axis)	Fanuc Alarm 409 means the servo load on the Z-axis exceeded the allowable threshold. Learn the common causes and how to fix Fanuc 409.	Fix →
Fanuc Alarm 411 — Causes & Fix	What Fanuc Alarm 411 servo error means, why it trips, and how to diagnose and fix it step by step.	Fix →
Fanuc Alarm 414 — Servo Axis Following Error Fix	Fanuc Alarm 414 means a servo axis exceeded its following error tolerance. This guide covers mechanical, encoder, and parameter causes with step-by-step fixes.	Fix →
Fanuc Alarm 424 — Causes & Fix	What Fanuc Alarm 424 servo axis following error means, why it trips, and how to diagnose and fix it step by step.	Fix →
Fanuc Alarm 435 — Causes & Fix	What Fanuc Alarm 435 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 436 — Causes & Fix	What Fanuc Alarm 436 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 437 — Servo Following Error 4th Axis Causes & Fix	What Fanuc alarm 437 means, why the 4th axis servo following error trips, and how to fix it step by step.	Fix →
Fanuc Alarm 460: Spindle Speed Error — Detailed Troubleshooting	Fanuc Alarm 460 spindle speed error: detailed causes, diagnostic steps, and fix procedures for Fanuc 0i, 16i, 18i, 30i, and 31i CNC systems.	Fix →
Fanuc Alarm 460 — Spindle Overload	Fanuc Alarm 460 means spindle load exceeded the allowable limit. Learn what causes Fanuc spindle overload alarms and how to fix them.	Fix →
Fanuc Alarm 5 — Stored Stroke Limit 2 Overtravel	What Fanuc alarm 5 means, why a stored stroke limit 2 overtravel occurs, and how to recover the axis.	Fix →
Fanuc Alarm 506 — Servo Following Error Fix	Fanuc Alarm 506 is a servo following error on CNC machining centers and lathes. Learn what causes it and how to diagnose servo drives, encoders, and mechanical issues.	Fix →
Fanuc Alarm 500 — Causes & Fix	What Fanuc Alarm 500 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 6 Overtravel — Causes & Fix	What Fanuc alarm 6 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 600 — Causes & Fix	What Fanuc Alarm 600 means, why it happens, and how to fix it step by step.	Fix →
Fanuc Alarm 700 Spindle Overheat — Detailed Fix Guide	Fanuc alarm 700 spindle overheat: detailed causes, spindle cooling checks, thermistor diagnosis, and repair steps for Fanuc-controlled machines.	Fix →
Fanuc Alarm 700 — Causes & Fix	What Fanuc CNC alarm 700 means, why the spindle overheats, and how to diagnose and fix it.	Fix →
Fanuc Alarm 750 — Causes & Fix	What Fanuc CNC alarm 750 means, why the spindle serial link errors, and how to fix it.	Fix →
Fanuc Alarm 800: APC Alarm — Causes and Fix	Fanuc Alarm 800 APC alarm: absolute pulse coder fault causes, diagnostic steps, and reset procedures for Fanuc 0i, 16i, 18i, 30i, and 31i systems.	Fix →
Fanuc Alarm 90 — Causes & Fix	What Fanuc alarm 90 reference return incomplete means, why it happens, and how to fix it step by step.	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 CNC Alarm Codes — Complete Reference	Fanuc CNC alarm codes: servo alarms (400–499), overtravel (1–6), APC alarms (300–360), and program errors (PS alarms) with causes and fixes.	Fix →
Fanuc OT Alarm — Software Overtravel (All Series)	Fanuc soft OT alarm means the control hit a software travel limit, not necessarily a hard limit switch. Learn how to back off the axis and correct the underlying cause.	Fix →
Fanuc P/S Alarm — Program and Syntax Error Codes Fix Guide	Fanuc P/S alarms mean a program or syntax error in the part program. Learn what the P/S number means, how to find the faulted block, and how to fix common syntax errors.	Fix →

Haas Error Codes (39 guides)

Guide	Description	Fix
Haas CNC Alarm 101 — Emergency Stop Active Fix	Haas CNC Alarm 101 means the emergency stop circuit is open. This guide covers how to diagnose and clear Alarm 101 on Haas mills and lathes step by step.	Fix →
Haas Alarm 102 — Servo Drive Fault Fix	Haas Alarm 102 means a servo drive fault has been detected on an axis. This guide covers diagnosis and fixes for the Haas CNC servo fault alarm.	Fix →
Haas Alarm 103 Overheating — CNC Machine Thermal Fault Diagnosis and Fix	Haas Alarm 103 overheating fault explained — causes including low coolant, dirty heat exchanger, and failed cabinet fan, with step-by-step diagnosis and fix.	Fix →
Haas Alarm 103 — Servo Overload Fix	Haas Alarm 103 means a servo motor or drive has exceeded its thermal or current limit. This guide covers diagnosis and fixes for the Haas CNC servo overload alarm.	Fix →
Haas Alarm 104 Feed Hold — Causes & Fix	What Haas alarm 104 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 105 E-Stop — Causes & Fix	What Haas alarm 105 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 106 — Causes & Fix	What Haas alarm 106 servo fault means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 107 — Causes & Fix	What Haas alarm 107 servo motor overtemp means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 108 — Causes & Fix	What Haas CNC alarm 108 means, why the spindle drive faults, and how to fix it.	Fix →
Haas Alarm 110 — Causes & Fix	What Haas CNC alarm 110 means, why the axis drive faults, and how to diagnose and fix it.	Fix →
Haas Alarm 111 — Drive Fault	What Haas CNC alarm 111 means, why a drive fault occurs, and how to diagnose and fix the servo drive system.	Fix →
Haas Alarm 112 — Motor Overtemp	What Haas CNC alarm 112 means, why a servo motor overtemperature occurs, and how to diagnose and fix it.	Fix →
Haas Alarm 113 — Spindle Encoder Fault Causes & Fix	What Haas alarm 113 spindle encoder fault means, why it triggers, and how to fix it step by step.	Fix →
Haas Alarm 114 — Spindle Over Speed Causes & Fix	What Haas alarm 114 spindle over speed means, why it triggers, and how to fix it step by step.	Fix →
Haas Alarm 115 Spindle Overload — Causes & Fix	What Haas Alarm 115 spindle overload means, why it trips, and how to diagnose and fix it step by step.	Fix →
Haas Alarm 116 — Causes & Fix	What Haas Alarm 116 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 117 — Causes & Fix	What Haas Alarm 117 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 118 — Spindle Orientation Fault Causes & Fix	What Haas alarm 118 means, why spindle orientation fails, and how to fix it step by step.	Fix →
Haas Alarm 120-129 — Automatic Tool Changer (ATC) Fault Fix Guide	Haas Alarm 120-129 ATC fault codes explained — what each ATC alarm means, how to safely recover, diagnose proximity switches and air pressure, and fix tool changer faults.	Fix →
Haas Alarm 119 — Spindle Not At Speed Causes & Fix	What Haas alarm 119 means, why the spindle fails to reach commanded speed, and how to fix it step by step.	Fix →
Haas Alarm 121 — ATC Arm Fault	Haas Alarm 121 means the automatic tool changer arm failed to complete its motion correctly. Learn the causes and how to fix Haas Alarm 121.	Fix →
Haas Alarm 122 — ATC Chain Fault	Haas Alarm 122 means the automatic tool changer chain or carousel failed to index correctly. Learn the causes and how to fix Haas Alarm 122.	Fix →
Haas Alarm 123 — Causes & Fix	What Haas Alarm 123 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 124 — Causes & Fix	What Haas Alarm 124 means, why it happens, and how to fix it step by step.	Fix →
Haas Alarm 125 Tool Carousel Fault — Causes & Fix	What Haas Alarm 125 tool carousel fault means, why it trips, and how to diagnose and fix it step by step.	Fix →
Haas Alarm 126 — ATC Door Fault	Haas alarm 126 ATC door fault: what it means, common causes, and how to fix tool changer door problems on Haas mills.	Fix →
Haas Alarm 127 — Tool Unclamped Fault	Haas alarm 127 tool unclamped fault: causes, drawbar checks, air pressure requirements, and repair steps for Haas mills.	Fix →
Haas Alarm 130: Spindle Speed Error — Causes and Fix	Haas Alarm 130 spindle speed error: detailed causes, diagnostic steps, and repair procedures for Haas VF, ST, EC, and UMC series machines.	Fix →
Haas Alarm 128: Tool Change Error - Causes and Fixes	Haas Alarm 128 tool change error causes, reset steps, and repair guidance for VF, TM, and ST series CNC machines.	Fix →
Haas Alarm 129: Spindle Orientation Error — Fix Guide	Haas Alarm 129 spindle orientation error: causes, diagnostic steps, and repair procedures for Haas VF, ST, and EC series CNC machines.	Fix →
Haas Alarm 131 — E-Stop Chain Fault Fix	Haas Alarm 131 E-Stop Chain Fault — learn what triggers it, how to check every E-stop button and door interlock, and how to clear this critical safety alarm fast.	Fix →
Haas Alarm 132 — Servo Amplifier Fault Fix	Haas Alarm 132 Servo Amplifier Fault — diagnose the failed servo drive, check motor windings and cables, and know when to replace the amplifier on Haas machining centers.	Fix →
Haas Alarm 134 Spindle Drive Fault — Causes & Fix	What Haas Alarm 134 spindle drive fault means, why it trips, and how to diagnose and fix it step by step.	Fix →
Haas CNC Alarm Codes — Complete Guide (100-Series and Up)	Haas CNC alarm codes: all major alarm numbers including 100-series emergency stops, spindle alarms, servo faults, and ATC faults with fixes.	Fix →
Haas EC-400 Horizontal Machining Center Alarm Codes	Haas EC-400 horizontal machining center alarm codes and diagnostics. Common HMC alarms, causes, and technician-level troubleshooting.	Fix →
Haas Next Generation Control Alarm Codes Guide	Haas Next Generation Control (NGC) alarm codes: what each means and how to fix it.	Fix →
Haas SL-20 Lathe Common Alarms — What They Mean and How to Fix Them	Complete guide to common Haas SL-20 lathe alarms, including turret, spindle, servo, and overtravel faults with practical troubleshooting tips.	Fix →
Haas VF-2 Common Alarms Guide — What They Mean and How to Fix Them	Complete guide to the most common Haas VF-2 alarms, including spindle, tool changer, overtravel, and servo faults with practical troubleshooting steps.	Fix →
Haas VF-4 Common Alarms Guide — What They Mean and How to Fix Them	Complete guide to common Haas VF-4 alarms, including spindle, tool changer, axis, and overtravel faults with practical troubleshooting steps.	Fix →

Mazak Error Codes (16 guides)

Guide	Description	Fix
Mazak Alarm 1 Servo Alarm — Causes & Fix	What Mazak alarm 1 means, why it happens, and how to fix it step by step.	Fix →
Mazak Alarm 100 Spindle Alarm — Causes & Fix	What Mazak alarm 100 means, why a spindle alarm occurs, and how to diagnose and fix the spindle drive system.	Fix →
Mazak Alarm 200 — Spindle Speed Error Causes & Fix	What Mazak alarm 200 spindle speed error means, why it triggers, and how to fix it step by step.	Fix →
Mazak Alarm 400 Servo Error — Causes & Fix	What Mazak alarm 400 servo error means, why it happens, and how to fix it step by step.	Fix →
Mazak Alarm 50 Servo — Causes & Fix	What Mazak CNC alarm 50 servo drive fault means, how to diagnose it, and how to fix it.	Fix →
Mazak Alarm 500 PC Alarm — Causes & Fix	What Mazak Alarm 500 (PC Alarm) means, why it happens, and how to fix it step by step.	Fix →
Mazak Alarm 600 ATC — Automatic Tool Changer Fault Causes & Fix	What Mazak alarm 600 ATC means, why the automatic tool changer faults, and how to fix it step by step.	Fix →
Mazak Alarm 700 — MPC Alarm	Mazak Alarm 700 indicates an MPC (motion processor / motion controller) alarm. Learn the usual causes, diagnostics, and when this points to a control hardware problem.	Fix →
Mazak Alarm 800 — Tool Magazine Fault	Mazak alarm 800 tool magazine fault: causes, magazine sensor checks, ATC timing issues, and repair steps for Mazak machining centers.	Fix →
Mazak CNC Alarm Codes — Common Faults and Fixes	Mazak CNC alarm codes: servo alarms (1–99), spindle alarms (100–299), servo axis faults (400–499), ATC faults (600+), and PC alarms (500+) with fixes.	Fix →
Mazak Alarm 900 Tool Magazine Index Fault - Causes & Fix	What Mazak Alarm 900 (Tool Magazine Index Fault) means, why it happens, and how to fix it step by step.	Fix →
Mazak CNC Alarm 200 Parameter Fault — Causes & Fix	What Mazak CNC Alarm 200 (Parameter Fault) means, why it happens, and how to fix it step by step.	Fix →
Mazak CNC Alarm 30 — Servo Alarm Fix	Mazak CNC alarm 30 means a servo amplifier fault on Quick Turn, Variaxis, and Integrex series machines — here's how to diagnose and fix it.	Fix →
Mazak Integrex Error Codes Guide — Common Mazatrol and Servo Faults	Complete guide to common Mazak Integrex error codes, servo alarms, spindle faults, and machine protection alarms with troubleshooting steps.	Fix →
Mazak Matrix/Matrix 2 Fault Code Guide — Complete Reference	Mazak Matrix and Matrix 2 CNC control fault codes: alarm descriptions, servo, spindle, and system alarms with diagnostic steps and troubleshooting.	Fix →
Mazak Nexus Series Error Codes: Complete Guide	Mazak Nexus CNC error codes and alarm diagnostics. Alarm categories, causes, and technician-level troubleshooting for Nexus turning and machining centers.	Fix →

Siemens Error Codes (10 guides)

Guide	Description	Fix
Siemens Sinumerik 828D Alarm Codes Guide — Complete Diagnostic Reference	Complete guide to Siemens Sinumerik 828D alarm codes, meanings, causes, and first-step troubleshooting procedures for CNC technicians.	Fix →
Siemens 840D Alarm 380000 — Causes & Fix	What Siemens Sinumerik 840D Alarm 380000 means, why it happens, and how to fix it step by step.	Fix →
Siemens SINAMICS S120 Fault F07900 — Motor Overtemperature Fix	Siemens SINAMICS S120 fault F07900 and F07901 motor overtemperature — causes, step-by-step fix, related faults F30001 and F30011, and parts table for the S120 servo/drive system.	Fix →
Siemens Sinumerik 840D Alarm 25000 — Causes & Fix	What Siemens Sinumerik 840D Alarm 25000 means, why it happens, and how to fix it step by step.	Fix →
Siemens SINUMERIK Alarm 25000 — Drive Fault Fix	Siemens SINUMERIK alarm 25000 series means an axis drive fault on 828D and 840D controllers — here's how to diagnose and fix it.	Fix →
Siemens Sinumerik Alarm 25201 — Causes & Fix	What Siemens Sinumerik alarm 25201 means, why drive overcurrent trips, and how to fix it.	Fix →
Siemens Sinumerik Alarm 300204 — Causes & Fix	What Siemens Sinumerik 300204 means, why it happens, and how to fix it step by step.	Fix →
Siemens Sinumerik Alarm 380500 — Causes & Fix	What Siemens Sinumerik alarm 380500 means, why it happens, and how to fix it step by step.	Fix →
Siemens Sinumerik Alarm 380600 — Encoder Fault	What Siemens Sinumerik alarm 380600 means, why an encoder fault occurs, and how to diagnose and fix it.	Fix →
Siemens SINAMICS V90 Fault Codes - F30001, F07900, F31101 Fixes	Siemens SINAMICS V90 servo drive fault code guide for F30001 overcurrent, F07900 motor blocked behavior, encoder faults, and common startup alarms.	Fix →

Okuma Error Codes (13 guides)

Guide	Description	Fix
Okuma CNC Alarm 1013 — Servo Axis Fault Fix	Okuma CNC alarm 1013 means servo amplifier thermal overload on OSP-P300 and P200 series controllers — here's how to diagnose and fix it.	Fix →
Okuma CNC Alarm 1050 — Causes & Fix	What Okuma CNC alarm 1050 means, why the servo alarm trips, and how to diagnose and fix it.	Fix →
Okuma CNC Alarm 1201 — Causes & Fix	What Okuma CNC alarm 1201 spindle overload means, why it happens, and how to fix it step by step.	Fix →
Okuma CNC Alarm 1400 — Encoder Error	What Okuma CNC alarm 1400 means, why an encoder error occurs, and how to diagnose and fix the feedback system.	Fix →
Okuma CNC Alarm 1600 — Communication Error Causes & Fix	What Okuma CNC alarm 1600 means, why CNC to drive communication fails, and how to fix it step by step.	Fix →
Okuma CNC Alarm 1800 — Causes & Fix	What Okuma CNC Alarm 1800 means, why it happens, and how to fix it step by step.	Fix →
Okuma CNC Alarm 2000 — Communication Error	Okuma Alarm 2000 means a communication error within the CNC control or between the control and drive system. Learn the causes and how to troubleshoot it.	Fix →
Okuma CNC Alarm 2030 Spindle Drive Fault — Causes & Fix	What Okuma alarm 2030 means, why it happens, and how to fix it step by step.	Fix →
Okuma Alarm 3000 — Main CPU Error	Okuma CNC alarm 3000 main CPU error: causes, power supply checks, memory issues, and service steps for Okuma controls.	Fix →
Okuma CNC Alarm 4000 - Causes & Fix	What Okuma CNC Alarm 4000 means, why it happens, and how to fix it step by step.	Fix →
Okuma LB/LU Lathe Common Alarm Guide — OSP-P300 Series	Okuma LB and LU series CNC lathe common alarms for OSP-P300 and OSP-U100 controls: alarm descriptions, causes, and troubleshooting steps.	Fix →
Okuma LB-Series Alarm 1013 — Causes & Fix	What Okuma LB-Series Alarm 1013 means, why it happens, and how to fix it step by step.	Fix →
Okuma MC-V4020 Machining Center Alarm Codes: Complete Guide	Okuma MC-V4020 machining center alarm codes and diagnostics. Alarm categories, causes, and technician-level troubleshooting for Okuma OSP-P controls.	Fix →

Mitsubishi Error Codes (3 guides)

Guide	Description	Fix
Mitsubishi CNC Alarm 500 — Causes & Fix	What Mitsubishi CNC alarm 500 means on M70/M80 series, why servo error occurs, and how to fix it.	Fix →
Mitsubishi CNC Alarm Y96 — Causes & Fix	What Mitsubishi CNC Alarm Y96 means, why it happens, and how to fix it step by step.	Fix →
Mitsubishi MR-J4 Servo Amplifier Alarm Codes — AL.10, AL.16, AL.30, AL.50 Fix	Mitsubishi MR-J4 servo amplifier alarm codes — AL.10 undervoltage, AL.16 encoder error, AL.30 regeneration fault, AL.32 overcurrent, AL.50 overload. Causes, step-by-step fixes, and parts table.	Fix →

Mori Seiki Error Codes (1 guides)

Guide	Description	Fix
Mori Seiki CNC Fault Codes — Complete Troubleshooting Guide	Mori Seiki and DMG Mori CNC fault codes for NL, NX, NHX, and DMU series. What each code means and how to fix it.	Fix →

Doosan Error Codes (2 guides)

Guide	Description	Fix
Doosan CNC Fault Codes — Complete Troubleshooting Guide	Doosan CNC fault codes for PUMA, LYNX, DNM, and DVF series. What each alarm means and how to fix it.	Fix →
Doosan CNC Alarm Codes Guide — Fanuc / Fanuc i Series Controls	Doosan CNC machine alarm codes for Puma, DNM, and Lynx series with Fanuc 0i and 31i controls: common alarms, causes, and troubleshooting steps.	Fix →

General CNC Guides (16 guides)

Guide	Description	Fix
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.	Fix →
CNC Alarm Reset Guide: How to Clear Alarms Safely	Complete guide to clearing CNC alarms safely on Haas, Fanuc, Mazak, DMG Mori, Siemens, and other common machine controls.	Fix →
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.	Fix →
DMG Mori DMF Series Fault Codes — Common Alarms and Fixes	Complete guide to common DMG Mori DMF series fault codes, including spindle, servo, lubrication, and control alarms with practical troubleshooting steps.	Fix →
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.	Fix →
Hardinge CNC Fault Codes — Complete Troubleshooting Guide	Hardinge CNC fault codes for Bridgeport, GS-series lathes, and VMC series. What each alarm means and how to fix it.	Fix →
Heidenhain TNC Error 399 — Causes & Fix	What Heidenhain TNC Error 399 means, why it happens, and how to fix it step by step.	Fix →
Heidenhain Error Code 399 Servo Error — Causes & Fix	What Heidenhain TNC 640 error code 399 means, why a servo error occurs, and how to diagnose and recover the axis.	Fix →
Heidenhain TNC 640 Error Code Guide — Complete Diagnostic Reference	Complete guide to Heidenhain TNC 640 error codes, meanings, causes, and first-step troubleshooting procedures for CNC technicians.	Fix →
Heidenhain iTNC 530 Error Codes: Complete Guide	Heidenhain iTNC 530 CNC control error codes and diagnostics. Error categories, causes, and technician-level troubleshooting.	Fix →
Hurco CNC Fault Codes — Complete Troubleshooting Guide	Hurco CNC fault codes for VM, VMX, TM, and TMX series. What each code means and how to fix it.	Fix →
Makino CNC Fault Codes — Complete Troubleshooting Guide	Makino CNC fault codes for a51, a61, D500, F5, and V56 series. What each code means and how to fix it.	Fix →
NUM CNC Alarm E27 — Servo Error Causes & Fix	What NUM CNC alarm E27 means on NUM 1060/1080 series controls, why servo errors occur, and how to fix it step by step.	Fix →
NUM CNC Alarm E28 — Causes & Fix	What NUM CNC Alarm E28 means, why it happens, and how to fix it step by step.	Fix →
Servo Motor Fault Codes Guide	Master reference for servo motor fault codes, drive alarms, and common troubleshooting patterns across Fanuc, Mitsubishi, Siemens, Yaskawa, Delta, and more.	Fix →
Yaskawa Sigma-7 SGD7S Servo Drive Alarm Codes — Diagnosis & Fix	Yaskawa Sigma-7 SGD7S servo drive alarm codes explained — AL.10 overcurrent, AL.16 encoder error, AL.20 regenerative overload, AL.30 regen circuit, and more. Step-by-step fixes and parts table.	Fix →

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