Danfoss VLT FC202 Drive Fault Codes List

Access the complete reference guide for Danfoss VLT AQUA Drive FC 202 fault codes. Learn to diagnose dry run alarms, cascade controller errors, and reset Trip Locks via MCT 10.

Danfoss FC 202 Fault Codes Reference Table

WARNING 1, 10 Volts low
WARNING/ALARM 2, Live zero error
WARNING/ALARM 3, No motor
WARNING/ALARM 4, Mains phase loss
WARNING 5, DC link voltage high
WARNING 6, DC link voltage low
WARNING/ALARM 7, DC overvoltage
WARNING/ALARM 8, DC under voltage
WARNING/ALARM 9, Inverter overload
WARNING/ALARM 10, Motor overload temperature
WARNING/ALARM 11, Motor thermistor overtemp
WARNING/ALARM 12, Torque limit
WARNING/ALARM 13, Over current
ALARM 14, Earth (ground) fault
ALARM 15, Hardware mismatch
ALARM 16, Short circuit
WARNING/ALARM 17, Control word timeout
WARNING/ALARM 20, Temp. input error
WARNING/ALARM 21, Parameter error
WARNING/ALARM 22, Hoist mechanical brake
WARNING 23, Internal fan fault
WARNING 24, External fan fault
WARNING 25, Brake resistor short circuit
WARNING/ALARM 26, Brake resistor power limit
WARNING/ALARM 28, Brake check failed
ALARM 29, Heat sink temp
ALARM 30, Motor phase U missing
ALARM 31, Motor phase V missing
ALARM 32, Motor phase W missing
ALARM 33, Inrush fault
WARNING/ALARM 34, Fieldbus communication fault
WARNING/ALARM 35, Option fault
WARNING/ALARM 36, Mains failure
ALARM 37, Phase imbalance
ALARM 38, Internal fault
ALARM 39, Heat sink sensor
WARNING 40, Overload of digital output terminal 27
WARNING 41, Overload of digital output terminal 29
WARNING 42, Overload of digital output on X30/6 or X30/7
ALARM 43, Ext. supply
ALARM 45, Earth fault 2
ALARM 46, Power card supply
WARNING 47, 24 V supply low
WARNING 48, 1.8 V supply low
WARNING 49, Speed limit
ALARM 50, AMA calibration failed
ALARM 51, AMA check Unom and Inom
ALARM 52, AMA low Inom
ALARM 53, AMA motor too big
ALARM 54, AMA motor too small
ALARM 55, AMA parameter out of range
ALARM 56, AMA interrupted by user
ALARM 57, AMA internal fault
ALARM 58, AMA Internal fault
WARNING 59, Current limit
WARNING 60, External interlock
WARNING/ALARM 61, Feedback error
WARNING 62, Output frequency at maximum limit
ALARM 63, Mechanical brake low
WARNING 64, Voltage Limit
WARNING/ALARM 65, Control card over temperature
WARNING 66, Heat sink temperature low
ALARM 67, Option module configuration has changed
ALARM 68, Safe Stop activated
ALARM 69, Power card temperature
ALARM 70, Illegal FC configuration
WARNING/ALARM 71, PTC 1 Safe Stop
ALARM 72, Dangerous failure
WARNING 73, Safe Stop auto restart
ALARM 74, PTC Thermistor
ALARM 75, Illegal profile sel.
WARNING 76, Power unit setup
WARNING 77, Reduced power mode
ALARM 78, Tracking error
ALARM 79, Illegal power section configuration
ALARM 80, Drive initialised to default value
ALARM 81, CSIV corrupt
ALARM 82, CSIV parameter error
ALARM 83, Illegal option combination
ALARM 84, No safety option
ALARM 88, Option detection
WARNING 89, Mechanical brake sliding
ALARM 90, Feedback monitor
ALARM 91, Analog input 54 wrong settings
ALARM 96, Start delayed
WARNING 97, Stop delayed
WARNING 98, Clock fault
ALARM 99, Locked rotor
WARNING/ALARM 104, Mixing fan fault
WARNING/ALARM 122, Mot. rotat. unexp.
ALARM 144, Inrush Supply
ALARM 145, External SCR disable
WARNING/ALARM 146, Mains voltage
WARNING/ALARM 147, Mains frequency
WARNING/ALARM 148, System temp
WARNING 163, ATEX ETR cur.lim.warning
ALARM 164, ATEX ETR cur.lim.alarm
WARNING 165, ATEX ETR freq.lim.warning
ALARM 166, ATEX ETR freq.lim.alarm
WARNING 200, Fire mode
WARNING 201, Fire mode was active
WARNING 202, Fire mode limits exceeded
WARNING 203, Missing motor
WARNING 204, Locked rotor
WARNING 219, Compressor interlock
ALARM 243, Brake IGBT
ALARM 245, Heat sink sensor
ALARM 246, Power card supply
ALARM 247, Power card temperature
ALARM 248, Illegal power section configuration
WARNING 250, New spare part
WARNING 251, New type code
×

Description & Probable Cause

Troubleshooting

 

How to Read FC 202 Faults via LCP 102 & MCT 10

The AQUA Drive is designed to be user-friendly, offering detailed diagnostics directly on the screen or via PC connection:

  • LCP 102 (Graphical Panel): The standard FC 202 panel is graphical.
    • Info Button: If an alarm appears (e.g., “Alarm 29 Heatsink Temp”), press the [Info] button. The drive will display a paragraph of text explaining why the fault occurred and what to check, often removing the need for a manual.
    • Status Screens: For cascade systems, use the Status menu to see which pumps are staged on/off. A “fault” might actually be a “Pump Interlock” preventing operation.
  • MCT 10 Set-up Software: Connect your PC via the USB port or RS485.
    • Alarm Log: Check Parameter Group 15 (Drive Information) or the MCT 10 logs. The FC 202 stores the last 10 alarms with timestamps relative to power-up.
    • Trending: Use the Scope function to graph Pressure Feedback (Analog Input 54) vs. Motor Speed. This helps identify if “Water Hammer” or pressure spikes are causing the drive to trip.

Frequently Asked Questions (FAQ)

Q: What is the difference between a Trip and a Trip Lock?

A: This is a critical distinction for Danfoss drives:

  • Trip (Alarm): The drive stops the motor. You can reset it immediately via the panel or digital input once the cause is gone.
  • Trip Lock (Alarm Locked): A serious protection fault (e.g., Short Circuit, Earth Fault). The drive locks itself to prevent restarting into a dangerous condition. You must cycle the main power (turn off, wait for display to die, turn on) to clear a Trip Lock.

Q: How do I reset a Danfoss FC 202 fault?

A:

  1. Press the [Reset] key on the LCP 102.
  2. Toggle the Digital Input programmed for “Reset” (default is usually Terminal 19).
  3. Send a Reset word via Fieldbus (Profibus, PROFINET, Modbus).
  4. Note: If “Auto Reset” is enabled (Group 14-2x), the drive may try to restart automatically. Be careful near rotating machinery.

Q: Why does the drive show “Alarm 13” (Overcurrent) in a pump application?

A:

  • Ragging/Clogging: The pump impeller may be physically blocked by debris. The FC 202 has a Deragging feature (if configured) that can reverse the pump to clear this.
  • Ramp Time: If the “Ramp Up” time is too fast, the water column inertia causes high current. Increase the ramp time.
  • Check Valve: A stuck check valve can cause dead-heading or excessive load at start.

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