Danfoss VACON 100X Drive Fault Codes List

Access the complete reference guide for Danfoss VACON 100X decentralized drive fault codes. Learn to diagnose IP66 drive errors, use VACON Live, and troubleshoot STO faults.

VACON 100X Fault Codes Reference Table

  VACON 100X Fault Codes Reference Table

VACON 100X Fault Codes Reference Table

Fault Code, ID and Meaning Cause and Remedy
F1 (ID: 1, 2)

Overcurrent		 Cause:
AC drive has detected too high a current (>4*IH) in the motor cable:
  • sudden heavy load increase
  • short circuit in motor cables
  • unsuitable motor

Remedy:
  • Check loading.
  • Check motor.
  • Check cables and connections.
  • Make identification run.
  • Check ramp times.
F2 (ID: 10, 11)

Overvoltage		 Cause:
The DC-link voltage has exceeded the limits defined.
  • too short a deceleration time
  • brake chopper is disabled
  • high overvoltage spikes in supply
  • Start/Stop sequence too fast

Remedy:
  • Make deceleration time longer.
  • Use brake chopper or brake resistor (available as options).
  • Activate overvoltage controller.
  • Check input voltage.
F3 (ID: 20, 21)

Earth fault		 Cause:
Current measurement has detected that the sum of motor phase current is not zero.
  • insulation failure in cables or motor

Remedy:
Check motor cables and motor.
F5 (ID: 40)

Charging switch		 Cause:
The charging switch is open, when the START command has been given.
  • faulty operation
  • component failure

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F7 (ID: 60)

Saturation		 Cause:
Various causes:
  • defective component
  • brake resistor short-circuit or overload

Remedy:
Cannot be reset from keypad. Switch off power. DO NOT RE-CONNECT POWER! Contact factory. If this fault appears simultaneously with F1, check motor cables and motor.
F8 (ID: 600)

System fault		 Cause:
Communication between control board and power unit has failed.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 601)

System fault		 Cause:
Communication between control board and power unit has interference, but it is still working.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 602)

System fault		 Cause:
Watchdog has reset the CPU.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 603)

System fault		 Cause:
Voltage of auxiliary power in power unit is too low.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 604)

System fault		 Cause:
Phase fault: Voltage of an output phase does not follow the reference.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 605)

System fault		 Cause:
CPLD has faulted but there is no detailed information about the fault.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 606)

System fault		 Cause:
Control and power unit software are incompatible.

Remedy:
Update software. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 607)

System fault		 Cause:
Software version cannot be read. There is no software in power unit.

Remedy:
Update power unit software. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 608)

System fault		 Cause:
CPU overload. Some part of the software (for example application) has caused an overload situation. The source of fault has been suspended.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 609)

System fault		 Cause:
Memory access has failed. For example, retain variables could not be restored.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 610)

System fault		 Cause:
Necessary device properties cannot be read.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 614)

System fault		 Cause:
Configuration error.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 647)

System fault		 Cause:
Software error.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 648)

System fault		 Cause:
Invalid function block used in application. System software and application are not compatible.

Remedy:
Update software. Should the fault re-occur, contact the distributor near to you.
F8 (ID: 649)

System fault		 Cause:
Resource overload. Error when loading parameter initial values. Error when restoring parameters. Error when saving parameters.

Remedy:
Update software. Should the fault re-occur, contact the distributor near to you.
F9 (ID: 80, 81)

Undervoltage		 Cause:
DC-link voltage is under the voltage limits defined.
  • most probable cause: too low a supply voltage
  • AC drive internal fault
  • defect input fuse
  • external charge switch not closed

NOTE! This fault is activated only if the drive is in Run state.

Remedy:
In case of temporary supply voltage break reset the fault and restart the AC drive. Check the supply voltage. If it is adequate, an internal failure has occurred. Contact the distributor near to you.
F10 (ID: 91)

Input phase		 Cause:
Input line phase is missing.

Remedy:
Check supply voltage, fuses and cable.
F11 (ID: 100)

Output phase supervision		 Cause:
Current measurement has detected that there is no current in one motor phase.

Remedy:
Check motor cable and motor.
F12 (ID: 110)

Brake chopper supervision		 Cause:
No brake resistor installed. Brake resistor is broken. Brake chopper failure.

Remedy:
Check brake resistor and cabling. If these are ok, the chopper is faulty. Contact the distributor near to you.
F12 (ID: 111)

Brake chopper saturation alarm		 Cause:
Brake chopper failure.

Remedy:
Check brake resistor and cabling. If these are ok, the chopper is faulty. Contact the distributor near to you.
F13 (ID: 120)

AC drive undertemperature		 Cause:
Too low temperature measured in power unit’s heatsink or board. Heatsink temperature is under -10°C.

Remedy:
Check the ambient temperature.
F14 (ID: 130, 131, 132, 133)

AC drive overtemperature		 Cause:
Too high temperature measured in power unit’s heatsink or board. Heatsink temperature is over 100°C.

Remedy:
  • Check the correct amount and flow of cooling air.
  • Check the heatsink for dust.
  • Check the ambient temperature.
  • Make sure that the switching frequency is not too high in relation to ambient temperature and motor load.
F15 (ID: 140)

Motor stalled		 Cause:
Motor is stalled.

Remedy:
Check motor and load.
F16 (ID: 150)

Motor overtemperature		 Cause:
Motor is overloaded.

Remedy:
Decrease motor load. If no motor overload exists, check the temperature model parameters.
F17 (ID: 160)

Motor underload		 Cause:
Motor is underloaded.

Remedy:
Check load.
F19 (ID: 180, 181)

Power overload		 Cause:
Drive power is too high.

Remedy:
Decrease load.
F25 (ID: 240)

Motor control fault		 Cause:
Start angle identification has failed.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F25 (ID: 241)

Motor control fault		 Cause:
Generic motor control fault.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F30 (ID: 290)

STO fault		 Cause:
Safe OFF signal A does not allow AC drive to be set to READY state.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F30 (ID: 291)

STO fault		 Cause:
Safe OFF signal B does not allow AC drive to be set to READY state.

Remedy:
Reset the fault and restart. Should the fault re-occur, contact the distributor near to you.
F32 (ID: 312)

Fan cooling		 Cause:
Fan life time is up.

Remedy:
Change fan and reset fan life time counter.
F33 (ID: 320)

Fire mode enabled		 Cause:
Fire mode of the drive is enabled. The drive's protections are not in use.

Remedy:
Check the parameter settings.
F37 (ID: 360)

Device changed (same type)		 Cause:
Option board changed for one previously inserted in the same slot. The board’s parameter settings are saved.

Remedy:
Device is ready for use. Old parameter settings will be used.
F38 (ID: 370)

Device changed (same type)		 Cause:
Option board added. The option board was previously inserted in the same slot. The board’s parameter settings are saved.

Remedy:
Device is ready for use. Old parameter settings will be used.
F39 (ID: 380)

Device removed		 Cause:
Option board removed from slot.

Remedy:
Device no longer available.
F40 (ID: 390)

Device unknown		 Cause:
Unknown device connected (power unit/option board).

Remedy:
Device no longer available.
F41 (ID: 400)

IGBT temperature		 Cause:
IGBT temperature (unit temperature + I2T) is too high.

Remedy:
  • Check loading.
  • Check motor size.
  • Make identification run.
F44 (ID: 430)

Device changed (different type)		 Cause:
Option board changed or Power unit changed. No parameter settings are saved.

Remedy:
Set the option board parameters again if option board was changed. Set converter parameters again if power unit was changed.
F45 (ID: 440)

Device changed (different type)		 Cause:
Option board added. The option board was not previously present in the same slot. No parameter settings are saved.

Remedy:
Set the option board parameters again.
F51 (ID: 1051)

External Fault		 Cause:
Fault activated by digital input.

Remedy:
Check the digital input or the device connected to it. Check the parameter settings.
F52 (ID: 1052, 1352)

Keypad communication fault		 Cause:
The connection between the control keypad and frequency converter is broken.

Remedy:
Check keypad connection and possible keypad cable.
F53 (ID: 1053)

Fieldbus communication fault		 Cause:
The data connection between the fieldbus master and fieldbus board is broken.

Remedy:
Check installation and fieldbus master.
F54 (ID: 1654, 1754)

Slot D/E fault		 Cause:
Defective option board or slot.

Remedy:
Check board and slot.
F65 (ID: 1065)

PC communication fault		 Cause:
The data connection between the PC and frequency converter is broken.

Remedy:
Check PC-drive cable.
F66 (ID: 1066)

Thermistor fault		 Cause:
The thermistor input has detected an increase of motor temperature.

Remedy:
Check motor cooling and load. Check thermistor connection (If thermistor input is not in use it has to be short circuited).
F68 (ID: 1301)

Maintenance counter 1 alarm		 Cause:
Maintenance counter has reached the alarm limit. It’s a characteristic fault of the HVAC Application.

Remedy:
Carry out the needed maintenance and reset counter.
F68 (ID: 1302)

Maintenance counter 2 alarm		 Cause:
Maintenance counter has reached the alarm limit. It’s a characteristic fault of the HVAC Application.

Remedy:
Carry out the needed maintenance and reset counter.
F68 (ID: 1303)

Maintenance counter 3 alarm		 Cause:
Maintenance counter has reached the alarm limit. It’s a characteristic fault of the HVAC Application.

Remedy:
Carry out the needed maintenance and reset counter.
F68 (ID: 1304)

Maintenance counter 4 alarm		 Cause:
Maintenance counter has reached the alarm limit. It’s a characteristic fault of the HVAC Application.

Remedy:
Carry out the needed maintenance and reset counter.
F69 (ID: 1310)

Fieldbus mapping error		 Cause:
Non-existing ID number is used for mapping values to Fieldbus Process Data Out.

Remedy:
Check parameters in Fieldbus Data Mapping menu.
F69 (ID: 1311)

Fieldbus mapping error		 Cause:
Not possible to convert one or more values for Fieldbus Process Data Out.

Remedy:
The value being mapped may be of undefined type. Check parameters in Fieldbus Data Mapping menu.
F69 (ID: 1312)

Fieldbus mapping error		 Cause:
Overflow when mapping and converting values for Fieldbus Process Data Out (16-bit).

Remedy:
The value being mapped may be too large.
F100 (ID: 1100)

Soft fill timeout		 Cause:
The Soft fill function in the PID controller has timed out. The wanted process value was not achieved within time. It’s a characteristic fault of the HVAC Application.

Remedy:
Reason might be a pipe burst.
F101 (ID: 1101)

Process supervision fault (PID1)		 Cause:
PID controller: Feedback value outside of supervision limits (and the delay if set). It’s a characteristic fault of the HVAC Application.

Remedy:
Check settings.
F105 (ID: 1105)

Process supervision fault (PID2)		 Cause:
PID controller: Feedback value outside of supervision limits (and the delay if set). It’s a characteristic fault of the HVAC Application.

Remedy:
Check settings.

How to Read VACON 100X Faults via Keypad & VACON Live

Troubleshooting the VACON 100X in 2026 usually involves a laptop, as the drives are often installed in washdown areas where opening the case is not ideal. Here are your primary tools:

  • VACON Live (PC Software): This is the standard tool for the VACON 100 family.
    • Connect via the specific USB-to-RS485 cable (black round connector) to the front service port.
    • Fault History: VACON Live displays the “Active Faults” and a history buffer. Crucially, it captures the Operating Days and Energy Counter at the time of the trip, helping you calculate exactly when the failure occurred.
  • Graphical Keypad: If accessible, the VACON 100X keypad is intuitive.
    • Status LEDs: The large LEDs on the front cover indicate status from a distance. Green = Ready/Run, Blinking Green = Alarm, Red = Fault.
    • Diagnostics Menu: Navigate to M4 (Diagnostics) to view active faults. The VACON 100X often provides a text description (e.g., “Motor Stall”) alongside the F-code.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm (A) and a Fault (F)?

A:

  • Alarm (A-Codes): The drive notifies you of a situation (e.g., A30 “Safe Torque Off”) but may continue to operate or coast. It resets automatically when the condition clears.
  • Fault (F-Codes): The drive stops modulation immediately (e.g., F1 “Overcurrent”). You must send a reset command to restart.

Q: How do I reset a VACON 100X fault?

A:

  1. Press the Reset button on the keypad (if equipped).
  2. Toggle the Digital Input configured for Fault Reset (Default is usually DIN3 or DIN4).
  3. Power Cycle: For critical hardware faults, switch off the local isolator switch, wait for the LEDs to die, and switch back on.

Q: Why does the drive show “F30” (Safe Torque Off)?

A: The VACON 100X has built-in Safe Torque Off (STO) inputs (S1/S2).

  • If you are not using a safety relay or E-Stop, ensure the yellow factory jumpers are installed on the control terminal block.
  • If installed on a vibrating machine, check that the STO terminal screws haven’t shaken loose.

Q: What is “F14” (Device Fault)?

A: This is a generic hardware failure code. However, on the 100X, it is often caused by moisture ingress if the cable glands were not tightened correctly during installation, or if the control board ribbon cable has vibrated loose.

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