Danfoss VACON 10 Fault Codes List

Access the complete reference guide for Danfoss VACON 10 micro drive fault codes. Learn to diagnose F1 Overcurrent, reset trips, and back up parameters via Vacon Live.

VACON 10 Fault Codes Reference Table

VACON 10 Fault Codes Reference Table

VACON 10 Fault Codes Reference Table

Fault Code and Meaning Cause and Remedy
1
Overcurrent		 Cause: Frequency converter has detected too high a current (>4*IN) in the motor cable.
  • sudden heavy load increase
  • short circuit in motor cables
  • unsuitable motor

Remedy:
  • Check loading.
  • Check motor size.
  • Check cables.
2
Overvoltage		 Cause: The DC-link voltage has exceeded the internal safety limit.
  • deceleration time is too short
  • high overvoltage spikes in mains

Remedy:
  • Increase the deceleration time (Par.4.3 or Par.4.6).
3
Earth fault		 Cause: Current measurement has detected extra leakage current at start.
  • insulation failure in cables or motor

Remedy:
  • Check motor cables and motor.
8
System fault		 Cause:
  • component failure
  • faulty operation

Remedy:
  • Reset the fault and restart.
  • If the fault re-occurs, contact the distributor near to you.
  • NOTE! If fault F8 occurs, find out the subcode of the fault from the Fault History menu.
9
Undervoltage		 Cause: The DC-link voltage has gone below the internal safety limit.
  • most probable cause: supply voltage is too low
  • frequency converter internal fault
  • Power outages

Remedy:
  • In case of temporary supply voltage break reset the fault and restart the frequency converter.
  • Check the supply voltage.
  • If it is adequate, an internal failure has occurred. Contact the distributor near to you.
11
Output phase fault		 Cause: Current measurement has detected that there is no current in one motor phase.

Remedy:
  • Check motor cable and motor.
13
Frequency converter undertemperature		 Cause: Heat sink temperature is under -10 °C.

Remedy:
  • Check the ambient temperature.
14
Frequency converter overtemperature		 Cause: Heat sink is overheated.

Remedy:
  • Check that the cooling air flow is not blocked.
  • Check the ambient temperature.
  • Make sure that the switching frequency is not too high in relation to ambient temperature and motor load.
15
Motor stalled		 Cause: Motor stall protection has tripped.

Remedy:
  • Check that the motor is able to rotate freely.
16
Motor overtemperature		 Cause: Motor overheating has been detected by frequency converter motor temperature model. Motor is overloaded.

Remedy:
  • Decrease the motor load.
  • If no motor overload exists, check the temperature model parameters.
17
Motor underload		 Cause: Motor underload protection has tripped.

Remedy:
  • Check motor and load, e.g. for broken belts or dry pumps.
22
EEPROM check sum fault		 Cause: Parameter save fault.
  • faulty operation
  • component failure
  • Note: Alarm 22 is issued for calibration data CRC check.

Remedy:
  • Contact the distributor near to you.
25
Microcontroller watchdog fault		 Cause:
  • faulty operation
  • component failure

Remedy:
  • Reset the fault and restart.
  • If the fault re-occurs, contact the distributor near to you.
27
Back EMF protection		 Cause: Drive has detected that the magnetized motor is running in start situation.
  • A rotating PM-motor

Remedy:
  • Make sure that there is no rotating PM-motor when the start command is given.
29
Thermistor fault		 Cause: The thermistor input of option board has detected increase.

Remedy:
  • Check motor cooling and loading.
  • Check thermistor connection (If thermistor input of the option board is not in use it has to be short circuited).
34
Internal bus communication		 Cause: Ambient interference or defective hardware.

Remedy:
  • If the fault re-occurs, contact the distributor near to you.
35
Application fault		 Cause: Application is not working properly.

Remedy:
  • Contact the distributor near to you.
41
IGBT Overtemperature		 Cause: Over temperature alarm is issued when the IGBT switch temperature exceeds 110 °C.

Remedy:
  • Check loading.
  • Check motor size.
  • Make identification run.
50
Analog input select		 Cause: Current at the analogue input is < 4mA; Voltage at the analogue input is < 2 V (selected signal range 4 to 20 mA or 2 to 10 V).
  • control cable is broken or loose.
  • signal source has failed.

Remedy:
  • Check the current loop circuitry.
51
External fault		 Cause: Digital input fault. Digital input has been programmed as external fault input and this input is active.

Remedy:
  • Remove the external device fault.
53
Fieldbus fault		 Cause: The data connection between the fieldbus Master and the fieldbus of the drive has broken.

Remedy:
  • Check installation.
  • If installation is correct, contact the nearest Vacon distributor.
55
Wrong run fault (FWD/REV conflict)		 Cause: Run forward and backward at the same time.

Remedy:
  • Check I/O control single 1 and I/O control single 2.
  • Single 1 should be changed to signal 1, single 2 should be changed to signal 2.
57
Identification fault		 Cause: Identification run has failed.

Remedy:
  • Run command was removed before completion of identification run.
  • Motor is not connected to frequency converter.
  • There is load on motor shaft.
111
Temperature fault		 Cause: Over low or over high temperature.

Remedy:
  • Check temperature signal from OPTBH board.
 

How to Read VACON 10 Faults via Keypad & Vacon Live

The VACON 10 is designed for simplicity, but accessing deep diagnostics in 2026 requires specific tools:

  • The Built-in Display: The drive features a basic LED/LCD screen.
    • Active Faults: When the drive trips, the “F” code flashes. You can navigate to the Monitor Menu (M3) to view the “Fault History” (V3.4) which stores the last 9 faults.
    • Status LEDs: The drive face has three LEDs. A blinking Red LED indicates an active fault that stops the motor.
  • Vacon Live (PC Software): To connect a PC, you need the optional MCA Adapter (Micro Communications Adapter) and a USB cable.
    • Parameter Backup: Since VACON 10 drives are cost-effective, they are often replaced rather than repaired. Using Vacon Live to save a parameter file (.vc1) allows you to clone the settings to a new drive in minutes.
    • Diagnostics: The software allows you to see the drive status word and internal DC bus voltage, helping rule out external power supply issues.

Frequently Asked Questions (FAQ)

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

A:

  • Alarm (A-Code): The drive detects an abnormal condition (e.g., A50 “Analog Input Low”) but continues to run. This acts as a warning.
  • Fault (F-Code): The drive stops modulation immediately (Trips) to protect the hardware (e.g., F1 “Overcurrent”). You must fix the issue and manually reset the drive.

Q: How do I reset a VACON 10 fault?

A:

  1. Press the Stop/Reset button on the keypad (if Keypad Control is active or configured).
  2. Toggle the Digital Input assigned to “Fault Reset” (typically DIN3 in the standard API).
  3. Cycle the mains power (wait for the display to turn off completely).

Q: Why does the drive trip on “F2” (Overvoltage) during stopping?

A: The VACON 10 has a small internal DC bus capacitance.

  • If you try to stop a high-inertia load (like a fan) too quickly, the energy regenerates back into the drive.
  • Fix: Increase the Deceleration Time (Parameter P1.4).

Q: Is the VACON 10 compatible with VACON 20 parts?

A: They are very similar, but the VACON 20 has more advanced features (like built-in PLC functionality). While connection cables (MCA) are often shared, parameter files may not be directly transferable without conversion tools.

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