HAAS^® alarm codes — plain-English diagnosis guide

Look up 60 of the most-Googled HAAS^® CNC alarms. Each has a plain-English explanation of what it means, the common causes, and what to check first — written by Keith Davies, an independent HAAS^® service engineer based in Watford. For a fast in-page lookup, use the search tool on the homepage.

Servo & Axis Faults

Following errors, overloads, drive faults and cable problems on X, Y, Z and additional axes.

102SERVOS OFFMill & Lathe 103X SERVO ERROR TOO LARGEMill & Lathe 104Y SERVO ERROR TOO LARGEMill & Lathe 105Z SERVO ERROR TOO LARGEMill & Lathe 106A SERVO ERROR TOO LARGEMill & Lathe 107EMERGENCY OFFMill & Lathe 108X SERVO OVERLOADMill & Lathe 109Y SERVO OVERLOADMill & Lathe 110Z SERVO OVERLOADMill & Lathe 111A SERVO OVERLOADMill & Lathe 182X CABLE FAULTMill & Lathe 193B AXIS DRIVE FAULTMill & Lathe 195B CABLE FAULTMill & Lathe 224X TRANSITION FAULTMill & Lathe

Spindle Faults

Orientation, gear-change, drive and overload faults on the main spindle.

116SPINDLE ORIENTATION FAULTMill & Lathe 117SPINDLE HIGH GEAR FAULTMill 118SPINDLE LOW GEAR FAULTMill 123SPINDLE DRIVE FAULTMill & Lathe 144SPINDLE OVERLOADMill & Lathe 198SPINDLE STALLEDMill & Lathe 129M-FIN TIMEOUT — SPINDLE NOT AT SPEEDMill & Lathe 176TOOL UNCLAMP FAULTMill

Tool Changer & Turret

Carousel, side-mount ATC, umbrella changer and lathe turret faults.

113SHUTTLE IN FAULTMill 113TURRET UNLOCK FAULTLathe 114SHUTTLE OUT FAULTMill 114TURRET LOCK FAULTLathe 115TURRET ROTATE FAULTMill & Lathe 120LOW AIR PRESSUREMill & Lathe 125SHUTTLE FAULT / TOOL TURRET FAULTMill & Lathe 164ATC RECOVERY REQUIREDMill 175CHUCK NOT CLAMPEDLathe

Travel & Limits

Overtravel, soft limit and stroke limit alarms — usually a programming or work offset issue.

overtravelOVERTRAVEL — Axis exceeded soft limitMill & Lathe limitTRAVEL LIMIT — Hardware overtravel switch hitMill & Lathe X+X-AXIS POSITIVE OVERTRAVELMill & Lathe Y+Y-AXIS POSITIVE OVERTRAVELMill & Lathe Z-Z-AXIS NEGATIVE OVERTRAVELMill & Lathe 149SPINDLE MUST BE STOPPEDMill & Lathe

Power & Environment

Voltage, air, lubrication, battery and temperature alarms.

119OVERVOLTAGEMill & Lathe 121LOW LUBE OR LOW PRESSUREMill & Lathe 122REGEN OVERHEATMill & Lathe 124LOW BATTERYMill & Lathe 200VECTOR DRIVE OVER TEMPMill & Lathe 151CABINET OVERHEATMill & Lathe 196COOLANT SPIGOT FAILUREMill 120ACOOLANT PUMP OVERLOADMill & Lathe

Communications & Control

MOCON, MAINCON, IO and parameter integrity faults.

101COMM. FAILURE WITH MOCON / MOCON MEMORY FAULTMill & Lathe 201PARAMETER CRC ERRORMill & Lathe 202SETTING CRC ERRORMill & Lathe 203LEAD SCREW CRC ERRORMill & Lathe 204OFFSET CRC ERRORMill & Lathe 791COMM. FAILURE WITH MOCON2Mill & Lathe

Programming & Macro

G-code and macro errors caught at runtime — usually a programming issue, not a machine fault.

199NEGATIVE RPMMill & Lathe 517EXPRESSION NOT ALLOWED WITH N OR OMill & Lathe 518ILLEGAL MACRO EXPRESSION REFERENCEMill & Lathe 522ILLEGAL ASSIGNMENT VAR OR VALUEMill & Lathe 523CONDITIONAL REQUIRED PRIOR TO THENMill & Lathe 525VAR REF ILLEGAL DURING MOVEMENTMill & Lathe 253TOOL OFFSET OUT OF RANGEMill & Lathe 316PROBE STYLUS BROKENMill & Lathe 9091NO TOOL OR EMPTY POCKETMill

A note on this list. Alarm wording and numbering can vary by HAAS^® machine model and software revision. The descriptions are written in plain English to help you understand what the machine is reporting and what to check first — they’re not a substitute for the official HAAS^® operator manual or for a qualified service engineer’s diagnosis. Always confirm the exact alarm message on your screen and consult your machine’s documentation before attempting any repair.