Reference
Equipment Fault Code Library
Free troubleshooting guides written by maintenance engineers. Common causes, step-by-step fixes, and when to call for help.
ABB
Fault 2310
Overcurrent
ABB ACS880 Fault 2310 overcurrent: megger test motor, check cables, adjust accel ramp. Step-by-step troubleshooting.
Fault 3220
Earth Fault
ABB ACS880 Fault 3220 earth fault: megger test, check cable insulation, inspect motor junction box for moisture.
Fault 7121
Analog Input Supervision
ABB ACS880 Fault 7121 analog input supervision: check 4-20mA wiring, transmitter power, and supervision parameters.
Allen-Bradley
Fault 01
Watchdog Timeout
Allen-Bradley Fault 01 watchdog timeout: common causes, step-by-step fix, and when to increase your scan time. Free diag…
Fault 16
I/O Not Responding
Allen-Bradley Fault 16 I/O Not Responding: how to find the faulted module, check the backplane, and restore communicatio…
Fault 04
Recoverable I/O Fault
Allen-Bradley Fault 04 recoverable I/O fault: causes, how to check module status, and clearing the fault without a full …
F012
HW Overcurrent
PowerFlex F012 overcurrent fault: motor megger test, cable inspection, accel time tuning, and when to replace the drive.…
F013
Ground Fault
PowerFlex F013 ground fault: how to megger-test motor cables, find insulation breakdown, and fix ground current leakage.
F002
Auxiliary Input
PowerFlex F002 auxiliary input fault: trace the external fault wiring, identify the tripped device, and restore the driv…
F033
Auto/Manual Fault
PowerFlex F033 auto/manual fault: fix command source conflicts, restore network control, and clear start inhibits.
F041
Heatsink Overtemp
PowerFlex F041 heatsink overtemp: clean the fan, check enclosure ventilation, verify current ratings. Step-by-step cooli…
User Program Error
User Program Error
Micro820 user program error: find the faulted instruction in CCW, fix division by zero or array bounds, and re-download.
Comms Timeout
Communication Timeout
Micro820 communication timeout: check network cables, Modbus wiring, IP conflicts, and timeout settings. Troubleshooting…
F064
Software Overcurrent
PowerFlex F064 software overcurrent: check motor parameter settings, measure actual load current, and verify drive duty …
F070
Power Loss
PowerFlex F070 power loss: check incoming voltage, inspect fuses and connections, verify upstream contactor. Troubleshoo…
AutomationDirect
E.OC
Overcurrent During Operation
GS20 E.OC overcurrent during operation: check the mechanical load, verify motor parameters, and clear the fault. Free di…
E.OU
DC Bus Overvoltage
GS20 E.OU overvoltage fault: increase decel time, install a braking resistor, and check your line voltage. Complete trou…
E.OH
Drive Overheating
GS20 E.OH overheating fault: check ambient temp, enclosure ventilation, and fan operation. Cooling troubleshooting for A…
E.OCA
Overcurrent During Acceleration
GS20 E.OCA overcurrent during acceleration: extend accel time, check torque boost, and verify drive sizing for your moto…
E.CF
Communication Fault
GS20 E.CF communication fault: check RS-485 wiring, baud rate, PLC program status, and communication timeout setting.
E.OL
Drive Overload
GS20 E.OL overload: check motor current parameter, measure actual load, add cooling for low-speed operation. Troubleshoo…
FANUC
Alarm 414
Servo Alarm: N-Axis Excess Error
FANUC Alarm 414 servo excess error: check encoder cables, servo gains, and mechanical binding. CNC troubleshooting guide…
Alarm 410
Servo Alarm: Excess Error (Deceleration)
FANUC Alarm 410 excess error during deceleration: troubleshoot servo feedback, encoder cables, and axis friction.
Alarm 401
Servo Alarm: VRDY Off
FANUC Alarm 401 VRDY off: check servo amplifier LEDs, E-stop circuit, power contactor, and DC bus voltage.
Alarm 306
Servo Overheating
FANUC Alarm 306 servo overheating: cool the motor, check the fan, reduce cutting parameters, and lubricate ways.
General
High Oil Temp
High Oil Temperature
Hydraulic high oil temperature: check the cooler, relief valve, reservoir level, and pump leakage. Complete troubleshoot…
Low Oil Level
Low Oil Level
Hydraulic low oil level fault: find the leak, stop the pump, and prevent cavitation damage. Step-by-step troubleshooting…
High Vibration
High Vibration Alarm
Motor high vibration alarm: check alignment, bearing condition, mounting bolts, and balance. ISO 10816 troubleshooting g…
Bearing Temp High
Bearing Temperature High
Motor bearing temperature high: check lubrication, alignment, belt tension, and bearing condition. Prevent bearing failu…
High Discharge Temp
High Discharge Temperature
Air compressor high discharge temperature: clean the oil cooler, check oil level, verify thermal valve, and ensure venti…
High Current
Motor High Current
Air compressor high current fault: check supply voltage, oil separator, minimum pressure valve, and motor connections.
Low Oil Pressure
Low Oil Pressure
Air compressor low oil pressure: stop immediately, check oil level, replace filter, inspect for leaks. Prevent element s…
Belt Slip
Belt Slip Detected
Conveyor belt slip fault: check tension, clean the drive pulley, inspect lagging, and verify speed sensor alignment.
Belt Misalignment
Belt Tracking / Misalignment
Conveyor belt tracking fault: adjust idlers, center the load, check for seized rollers, and level the frame. Alignment g…
Low Air Pressure
Low Air Pressure
Pneumatic low air pressure: check for leaks, inspect the FRL, verify compressor capacity, and audit the system. Troubles…
Cavitation
Cavitation Detected
Pump cavitation: check suction strainer, measure NPSH, verify suction valve, and adjust the operating point. Prevent imp…
Seal Leak
Mechanical Seal Leak
Pump mechanical seal leak: assess severity, plan replacement, inspect shaft sleeve, and verify seal flush. Maintenance g…
Low Water Cutoff
Low Water Cutoff
Boiler low water cutoff: check feedwater pump, clean the LWCO probe, verify the sight glass. Safety-critical troubleshoo…
High Head Pressure
High Head Pressure
Chiller high head pressure: clean condenser coils, check fans, verify cooling tower, and check refrigerant charge.
Ground Fault Trip
Ground Fault Relay Trip (50G/51G)
Ground fault relay trip (50G/51G): lock out, megger test to isolate, inspect cables and motors. NFPA 70E compliant guide…
Wire Feed Fault
Wire Feed Jam / Birdnest
MIG welder wire feed fault / birdnest: replace the contact tip, check liner, set drive roll tension. Quick fix guide.
No Label Detected
No Label Detected
Labeler no-label-detected fault: check the label roll, clean the sensor, match sensor type, and clean the peel plate.
AI Out of Range
Analog Input Out of Range
PLC analog input out of range: check field wiring, transmitter power, sensor health, and module configuration. Universal…
Siemens
F07011
Motor Overtemperature
Siemens SINAMICS F07011 motor overtemp: check cooling fans, thermal model parameters, and PTC sensor wiring. Troubleshoo…
F30011
Power Module Overtemperature
Siemens SINAMICS F30011 power module overtemp: fan check, cabinet cooling, and switching frequency tuning.
F01001
Overcurrent
Siemens SINAMICS F01001 overcurrent: megger test motor, re-run identification, increase ramp time. Troubleshooting guide…
F07900
Motor Stall / Locked Rotor
Siemens SINAMICS F07900 motor stall: check for mechanical blockage, verify motor data, and inspect the coupling and gear…
Yaskawa
oC
Overcurrent
Yaskawa oC overcurrent fault: check motor insulation, clear mechanical jams, increase accel time, and run auto-tune.
GF
Ground Fault
Yaskawa GF ground fault: megger test motor cables, check for moisture, and install output filters for long cable runs.
oV
DC Bus Overvoltage
Yaskawa oV overvoltage: increase decel time, enable stall prevention, install braking resistor. Complete troubleshooting…
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