Schneider ATV61 Drive Fault Codes

Complete reference list of Schneider Altivar 61 (ATV61) fault codes. Learn to troubleshoot HVAC errors like nLP (No Line Power), PHF (Phase Loss), and OCF on this pump/fan drive.

Schneider ATV61 Fault Codes Reference Table

Schneider ATV61 Fault Codes Reference Table

Schneider ATV61 Fault Codes Reference Table

Type in the search box to filter by Fault Code, Name, Cause, or Remedy.

Fault Code and Meaning Cause and Remedy
AI2F
[AI2 input]		 Cause: Non-conforming signal on analog input AI2.

Remedy:
  • Check the wiring of analog input AI2 and the value of the signal.
  • If necessary, modify the fault configuration via [AI2 4-20mA loss] (LFL2).
bOF
[DBR overload]		 Cause: The braking resistor is under excessive stress.

Remedy:
  • Check the size of the resistor and wait for it to cool down.
  • Check the [DB Resistor Power] (brP) and [DB Resistor value] (brU) parameters.
bUF
[DB unit sh. Circuit]		 Cause:
  • Short-circuit output from braking unit.
  • Braking unit not connected.

Remedy:
  • Check the wiring of the braking unit and the resistor.
  • Check the braking resistor.
  • The monitoring of this fault must be disabled by the [Brake res. fault Mgt] (bUb) parameter if there is no braking unit or resistor connected to the drive.
CrF1
[Precharge]		 Cause: Load relay control fault or charging resistor damaged.

Remedy:
  • Switch the drive off and then back on again.
  • Check the internal connections.
  • Inspect/repair the drive.
CrF2
[Thyr. soft charge]		 Cause: DC bus charging fault (thyristors).

Remedy:
  • Inspect/repair the drive.
dCF
[Differential curent Fault]		 Cause: Current difference between power block A and B (ATV61EC60 ... M14N4 or ATVEM15...M24Y only).

Remedy:
  • Check thyristor with [TEST THYRISTORS].
  • Check IGBT with [TRANSISTOR TEST].
  • Check current transformer.
EEF1
[Control Eeprom]		 Cause: Internal memory fault, control card.

Remedy:
  • Check the environment (electromagnetic compatibility).
  • Turn off, reset, return to factory settings.
  • Inspect/repair the drive.
EEF2
[Power Eeprom]		 Cause: Internal memory fault, power card.

Remedy:
  • Inspect/repair the drive.
EnF
[Encoder]		 Cause: Encoder feedback fault.

Remedy:
  • Check [Number of pulses] (PGI) and [Encoder type] (EnS).
  • Check that the encoder's mechanical and electrical operation, its power supply and connections are all correct.
  • If necessary, reverse the direction of rotation of the motor ([Output Ph rotation] (PHr) parameter) or the encoder signals.
FCF1
[Out. contact. stuck]		 Cause: The output contactor remains closed although the opening conditions have been met.

Remedy:
  • Check the contactor and its wiring.
  • Check the feedback circuit.
Fd2
[Damper open]		 Cause: The damper remains open although the closing conditions have been met.

Remedy:
  • Check the damper and its wiring.
  • Check the feedback circuit.
  • Check the time delay for the function.
HdF
[IGBT desaturation]		 Cause: Short-circuit or grounding at the drive output.

Remedy:
  • Check the cables connecting the drive to the motor, and the insulation of the motor.
  • Perform the diagnostic tests via the [1.10 DIAGNOSTICS] menu.
ILF
[internal com. link]		 Cause: Communication fault between option card and drive.

Remedy:
  • Check the environment (electromagnetic compatibility).
  • Check the connections.
  • Check that no more than 2 option cards (max. permitted) have been installed on the drive.
  • Replace the option card.
  • Inspect/repair the drive.
InF1
[Rating error]		 Cause: The power card is different from the card stored.

Remedy:
  • Check the reference of the power card.
InF2
[Incompatible PB]		 Cause: The power card is incompatible with the control card.

Remedy:
  • Check the reference of the power card and its compatibility.
InF3
[Internal serial link]		 Cause: Communication fault between the internal cards.

Remedy:
  • Check the internal connections.
  • Inspect/repair the drive.
InF4
[Internal MFG area]		 Cause: Internal data inconsistent.

Remedy:
  • Recalibrate the drive (performed by Schneider Electric Product Support).
InF6
[Internal-option]		 Cause: The option installed in the drive is not recognized.

Remedy:
  • Check the reference and compatibility of the option.
InF7
[Internal-hard init.]		 Cause: Initialization of the drive is incomplete.

Remedy:
  • Turn off and reset.
InF8
[Internal-ctrl supply]		 Cause: The control power supply is incorrect.

Remedy:
  • Check the control section power supply.
InF9
[Internal- I measure]		 Cause: The current measurements are incorrect.

Remedy:
  • Replace the current sensors or the power card.
  • Inspect/repair the drive.
InFA
[Internal-mains circuit]		 Cause: The input stage is not operating correctly.

Remedy:
  • Perform the diagnostic tests via the [1.10 DIAGNOSTICS] menu.
  • Inspect/repair the drive.
InFb
[Internal- th. sensor]		 Cause:
  • The drive temperature sensor is not operating correctly.
  • The braking unit's temperature sensor is not operating correctly.

Remedy:
  • Replace the temperature sensor.
  • Inspect/repair the drive.
  • Replace the braking unit's temperature sensor.
  • Inspect/repair the braking unit.
  • The monitoring of this fault must be disabled by the [Brake res. fault Mgt] (bUb) parameter if there is no braking unit connected to the drive.
InFC
[Internal-time meas.]		 Cause: Fault on the electronic time measurement component.

Remedy:
  • Inspect/repair the drive.
InFE
[internal- CPU]		 Cause: Internal microprocessor fault.

Remedy:
  • Turn off and reset. Inspect/repair the drive.
OCF
[Overcurrent]		 Cause:
  • Parameters in the [SETTINGS] and [MOTOR CONTROL] menus are not correct.
  • Inertia or load too high.
  • Mechanical locking.

Remedy:
  • Check the parameters.
  • Check the size of the motor/drive/load.
  • Check the state of the mechanism.
PrF
[Power removal]		 Cause: Fault with the drive’s “Power removal” safety function.

Remedy:
  • Inspect/repair the drive.
SCF1
[Motor short circuit]		 Cause: Short-circuit or grounding at the drive output.

Remedy:
  • Check the cables connecting the drive to the motor, and the insulation of the motor.
  • Perform the diagnostic tests via the [1.10 DIAGNOSTICS] menu.
SCF2
[Impedant sh. circuit]		 Cause: Impedant short circuit.

Remedy:
  • Reduce the switching frequency.
  • Connect chokes in series with the motor.
  • Check the adjustment of speed loop and brake.
  • If [Energy Sav.] (nLd) motor control type is used, change to an U/F type.
SCF3
[Ground short circuit]		 Cause: Significant earth leakage current at the drive output if several motors are connected in parallel.

Remedy:
  • Check the cables connecting the drive to the motor, and the insulation of the motor.
  • Reduce the switching frequency.
  • Connect chokes in series with the motor.
SOF
[Overspeed]		 Cause: Instability or driving load too high.

Remedy:
  • Check the motor, gain and stability parameters.
  • Add a braking resistor.
  • Check the size of the motor/drive/load.
  • Check the parameter settings for the [FREQUENCY METER] (FqF-) function.
SPF
[Speed fdback loss]		 Cause:
  • Encoder feedback signal missing.
  • No signal on "Pulse input", if the input is used for speed measurement.

Remedy:
  • Check the wiring between the encoder and the drive.
  • Check the encoder.
  • Check the wiring of the input and the detector used.
tnF
[Auto-tuning]		 Cause:
  • Special motor or motor whose power is not suitable for the drive.
  • Motor not connected to the drive.

Remedy:
  • Check that the motor/drive are compatible.
  • Check that the motor is present during auto-tuning.
  • If an output contactor is being used, close it during auto-tuning.
APF

[Application fault] 		Cause:
Controller Inside card fault.

Remedy:
  • Please refer to the card documentation.
CnF

[Com. network] 		Cause:
Communication fault on communication card.

Remedy:
  • Check the environment (electromagnetic compatibility).
  • Check the wiring.
  • Check the time-out.
  • Replace the option card.
  • Inspect/repair the drive.
COF

[CAN com.] 		Cause:
Interruption in communication on the CANopen bus.

Remedy:
  • Check the communication bus.
  • Check the time-out.
  • Refer to the CANopen User's Manual.
EPF1

[External flt-LI/Bit] 		Cause:
Fault triggered by an external device, depending on user.

Remedy:
  • Check the device, which caused the fault, and reset.
EPF2

[External fault com.] 		Cause:
Fault triggered by a communication network.

Remedy:
  • Check for the cause of the fault and reset.
FCF2

[Out. contact. open.] 		Cause:
The output contactor remains open although the closing conditions have been met.

Remedy:
  • Check the contactor and its wiring.
  • Check the feedback circuit.
Fd1

[Damper stuck] 		Cause:
The damper remains closed although the opening conditions have been met.

Remedy:
  • Check the damper and its wiring.
  • Check the feedback circuit.
  • Check the time delay for the function.
LCF

[input contactor] 		Cause:
The drive is not turned on even though [Mains V. time out] (LCt) has elapsed.

Remedy:
  • Check the contactor and its wiring.
  • Check the time-out.
  • Check the line/contactor/drive connection.
LFF2
LFF3
LFF4

[AI2 4-20mA loss]
[AI3 4-20mA loss]
[AI4 4-20mA loss] 		Cause:
Loss of the 4-20 mA reference on analog input AI2, AI3 or AI4.

Remedy:
  • Check the connection on the analog inputs.
  • If necessary, modify the fault configuration via [AIx 4-20mA loss] (LFLx).
nFF

[No Flow Fault] 		Cause:
Zero fluid.

Remedy:
  • Check and rectify the cause of the fault.
  • Check the zero fluid detection parameters.
ObF

[Overbraking] 		Cause:
Braking too sudden or driving load.

Remedy:
  • Increase the deceleration time.
  • Install a braking resistor if necessary.
  • Activate the [Dec ramp adapt.] (brA) function if compatible with the application.
OHF

[Drive overheat] 		Cause:
Power board -PCB over temperature.
Braking unit over temperature.
Phase module over temperature.
Rectifier over temperature.

Remedy:
  • Check the motor load, the drive ventilation and the ambient temperature.
  • Wait for the drive to cool down before restarting.
OLC

[Proc. Overload Flt] 		Cause:
Process overload.

Remedy:
  • Check and remove the cause of the overload.
  • Check the parameters of the [PROCESS UNDERLOAD] (OLd-) function.
OLF

[Motor overload] 		Cause:
Triggered by excessive motor current.

Remedy:
  • Check the setting of the motor thermal protection.
  • Check the motor load.
  • Wait for the drive to cool down before restarting.
OPF1

[1 motor phase loss] 		Cause:
Loss of one phase at drive output.

Remedy:
  • Check the connections from the drive to the motor.
OPF2

[3 motor phase loss] 		Cause:
Motor not connected or motor power too low.
Output contactor open.
Instantaneous instability in the motor current.

Remedy:
  • Check the connections from the drive to the motor.
  • If an output contactor is being used, parameterize [Output Phase Loss] (OPL) = [Output cut] (OAC).
  • Test on a low power motor or without a motor: In factory settings mode, motor phase loss detection is active [Output Phase Loss] (OPL) = [Yes] (YES). To check the drive in a test or maintenance environment, without having to use a motor with the same rating as the drive, deactivate motor phase loss detection.
  • Check and optimize the [IR compensation] (UFr), [Rated motor volt.] (UnS) and [Rated mot. current] (nCr) parameters, and perform [Auto tuning] (tUn).
OSF

[Mains overvoltage] 		Cause:
Line voltage too high.
Disturbed line supply.

Remedy:
  • Check the line voltage.
OtF1

[PTC1 overheat] 		Cause:
Overheating of the PTC1 probes detected.

Remedy:
  • Check the motor load and motor size.
  • Check the motor ventilation.
  • Wait for the motor to cool before restarting.
  • Check the type and state of the PTC probes.
OtF2

[PTC2 overheat] 		Cause:
Overheating of the PTC2 probes detected.

Remedy:
  • Check the motor load and motor size.
  • Check the motor ventilation.
  • Wait for the motor to cool before restarting.
  • Check the type and state of the PTC probes.
OtFL

[LI6=PTC overheat] 		Cause:
Overheating of PTC probes detected on input LI6.

Remedy:
  • Check the motor load and motor size.
  • Check the motor ventilation.
  • Wait for the motor to cool before restarting.
  • Check the type and state of the PTC probes.
PtF1

[PTC1 probe] 		Cause:
PTC1 probes open or short-circuited.

Remedy:
  • Check the PTC probes and the wiring between them and the motor/drive.
PtF2

[PTC2 probe] 		Cause:
PTC2 probes open or short-circuited.

Remedy:
  • Check the PTC probes and the wiring between them and the motor/drive.
PtFL

[LI6=PTC probe] 		Cause:
PTC probes on input LI6 open or short-circuited.

Remedy:
  • Check the PTC probes and the wiring between them and the motor/drive.
SCF4

[IGBT short circuit] 		Cause:
Power component fault.

Remedy:
  • Perform a test via the [1.10 DIAGNOSTICS] menu.
  • Inspect/repair the drive.
SCF5

[Motor short circuit] 		Cause:
Short-circuit at drive output.

Remedy:
  • Check the cables connecting the drive to the motor, and the motor’s insulation.
  • Perform tests via the [1.10 DIAGNOSTICS] menu.
  • Inspect/repair the drive.
SLF1

[Modbus com.] 		Cause:
Interruption in communication on the Modbus bus.

Remedy:
  • Check the communication bus.
  • Check the time-out.
  • Refer to the Modbus User's Manual.
SLF2

[PC com.] 		Cause:
Fault communicating with PC Software.

Remedy:
  • Check the PC-Software connecting cable.
  • Check the time-out.
SLF3

[HMI com.] 		Cause:
Fault communicating with the graphic display terminal.

Remedy:
  • Check the terminal connection.
  • Check the time-out.
SPIF

[PI Feedback] 		Cause:
PID feedback below lower limit.

Remedy:
  • Check the PID function feedback.
  • Check the PID feedback supervision threshold and time delay.
SSF

[Torque/current lim] 		Cause:
Switch to torque limitation.

Remedy:
  • Check if there are any mechanical problems.
  • Check the parameters of [TORQUE LIMITATION] (tLA-) and the parameters of the [TORQUE OR I LIM. DETECT.] (tId-) fault.
tJF

[IGBT overheat] 		Cause:
Drive overheated.

Remedy:
  • Check the size of the load/motor/drive.
  • Reduce the switching frequency.
  • Wait for the motor to cool before restarting.
ULF

[Proc. Underload Flt] 		Cause:
Process underload.

Remedy:
  • Check and remove the cause of the underload.
  • Check the parameters of the [PROCESS OVERLOAD] (OLd-) function.
CFF

[Incorrect config.] 		Cause:
Option card changed or removed.
The current configuration is inconsistent.

Remedy:
  • Check that there are no card errors.
  • In the event of the option card being changed/removed deliberately, see remarks.
  • Return to factory settings or retrieve the backup configuration, if it is valid.
CFI

[Invalid config.] 		Cause:
Invalid configuration. The configuration loaded in the drive via the bus is inconsistent.
[Max frequency] (tFr) has been set at a value higher than 599Hz.

Remedy:
  • Check the configuration loaded previously.
  • Load a compatible configuration.
  • Set [Max frequency] (tFr) at a value lower or equal to 599 Hz.
HCF

[Cards pairing] 		Cause:
The [CARDS PAIRING] (PPI-) function has been configured and a drive card has been changed.

Remedy:
  • In the event of a card error, reinsert the original card.
  • Confirm the configuration by entering the [Pairing password] (PPI) if the card was changed deliberately.
PHF

[Input phase loss] 		Cause:
Drive incorrectly supplied or a fuse blown.
Failure of one phase.
3-phase ATV61 used on a single-phase line supply.
Unbalanced load.
(This protection only operates with the drive on load).

Remedy:
  • Check the power connection and the fuses.
  • Use a 3-phase line.
  • Disable the fault by [Input phase loss] (IPL) = [No] (nO).
PrtF

[Power Ident] 		Cause:
The [Power Identification] (Prt) parameter is incorrect.
Control card replaced by a control card configured on a drive with a different rating.

Remedy:
  • Enter the correct parameter (reserved for Schneider Electric product support).
  • Check that there are no card errors.
  • In the event of the control card being changed deliberately, see remarks.
USF

[Undervoltage] 		Cause:
Line supply too low.
Transient voltage dip.
Damaged pre-charge resistor.
(This protection only operates with the drive running in motor mode).

Remedy:
  • Check the voltage and the parameters of [UNDERVOLTAGE MGT] (USb-).
  • Replace the pre-charge resistor.
  • Inspect/repair the drive.
CFF
[Incorrect config.]		 Cause:
  • Option card changed or removed.
  • Control block replaced by a control block configured on a drive with a different rating.
  • The current configuration is inconsistent.

Remedy:
  • Check that there are no card errors.
  • In the event of the option card being changed/removed deliberately, see manual remarks.
  • Check that there are no card errors.
  • In the event of the control block being changed deliberately, see manual remarks.
  • Return to factory settings or retrieve the backup configuration, if it is valid.
CFI / CFI2
[Invalid config.]		 Cause:
  • Invalid configuration.
  • The configuration loaded in the drive via the bus or communication network is inconsistent.

Remedy:
  • Check the configuration loaded previously.
  • Load a compatible configuration.
CSF
[Ch. Sw. fault]		 Cause:
  • Switch to not valid channels.

Remedy:
  • Check the function parameters.
dLF
[Dynamic load fault]		 Cause:
  • Abnormal load variation.

Remedy:
  • Check that the load is not blocked by an obstacle.
  • Removal of a run command causes a reset.
FbE
[FB fault]		 Cause:
  • Function blocks error.

Remedy:
  • See [FB Fault] (FbFt) for more details.
HCF
[Cards pairing]		 Cause:
  • The [CARDS PAIRING] (PPI-) function has been configured and a drive card has been changed.

Remedy:
  • In the event of a card error, reinsert the original card.
  • Confirm the configuration by entering the [Pairing password] (PPI) if the card was changed deliberately.
PHF
[Input phase loss]		 Cause:
  • Drive incorrectly supplied or a fuse blown.
  • One phase missing.
  • 3-phase ATV32 used on a single-phase line supply.
  • Unbalanced load.
  • This protection only operates with the drive on load.

Remedy:
  • Check the power connection and the fuses.
  • Use a 3-phase line supply.
  • Disable the detected fault by [Input phase loss] (IPL) = [No] (nO).
USF
[Undervoltage]		 Cause:
  • Line supply too low.
  • Transient voltage dip.

Remedy:
  • Check the voltage and the parameters of [UNDERVOLTAGE MGT] (USb-).
InIt
[Initialization in progress]		 Cause:
  • The microcontroller is initializing.
  • Search underway for communication configuration.

Remedy:
  • Wait for initialization to complete.
COM.E (Flashing)
[Communication error]		 Cause:
  • Time out detected fault (50 ms).
  • This message is displayed after 20 attempts at communication.

Remedy:
  • Check communication connections and parameters.
A-17 (Flashing)
[Alarm button]		 Cause:
  • A key has been held down for more than 10 seconds.
  • The keypad is disconnected.
  • The keypad wakes up when a key is pressed.

Remedy:
  • Release the key.
  • Check keypad connection.
CLr (Flashing)
[Confirmation of detected fault reset]		 Cause:
  • This is displayed when the STOP key is pressed once if the active command channel is the remote display terminal.

Remedy:
  • Informational message; no specific remedy required.
dEU.E (Flashing)
[Drive disparity]		 Cause:
  • The drive brand does not match that of the remote display terminal.

Remedy:
  • Ensure the remote display is compatible with the drive.
rOM.E (Flashing)
[ROM anomaly]		 Cause:
  • The remote display terminal detects a ROM anomaly on the basis of checksum calculation.

Remedy:
  • Replace the remote display terminal.
rAM.E (Flashing)
[RAM anomaly]		 Cause:
  • The remote display terminal detects a RAM anomaly.

Remedy:
  • Replace the remote display terminal.
CPU.E (Flashing)
[Other detected faults]		 Cause:
  • Other detected faults.

Remedy:
  • Check for other fault codes on the drive.
 

How to Read ATV61 Faults & History

The ATV61 typically comes with a removable Graphic Display Terminal (LCD screen) which gives full text descriptions, but smaller units or those with the terminal removed rely on the Integrated 7-Segment LED display.

  • Diagnostics Menu (1.10): To view active faults and history on the graphic terminal, navigate to Menu 1.10 DIAGNOSTICS.
    • Fault History: This menu stores the last 8 faults.
    • Drive Status: Shows the state of the motor and logical inputs at the moment of the trip.
  • Input Phase Loss (PHF): The ATV61 is very sensitive to input power quality. A PHF fault means one of the three phases (L1, L2, L3) is missing or unbalanced. If running on a generator, you may need to disable “Input Phase Loss” protection (Menu 1.8), though this is risky.
  • nLP (No Line Power): This is unique to the ATV61/71 architecture. If the drive is powered by an external 24V supply to keep the control board alive, but the 480V mains are off, it displays nLP. This is a status, not a fault.

Frequently Asked Questions (FAQ)

Q: The drive shows “nLP” and won’t run. What is wrong?

A: nLP stands for No Line Power.
This usually happens when the Control Board is powered (via terminals P24/0V) but the main DC Bus is uncharged (Mains power is Off).
Fix: Check your main circuit breaker or fuses. Once mains voltage is applied to L1/L2/L3, nLP will change to rdY (Ready).

Q: How do I fix “OCF” (Overcurrent) on a Fan/Pump?

A: On HVAC applications, OCF often indicates:
1. Start on the Fly: The fan was already spinning (windmilling) when the drive tried to start. Enable “Catch on the Fly” in the Fault Management menu.
2. Ramp Too Short: Trying to accelerate a heavy fan too fast. Increase the Acceleration Time (ACC).
3. Pipe Blockage: In rare cases, a sudden closed valve can cause a surge.

Q: What is “SPF” (Speed Feedback Loss)?

A: This occurs if you are using an encoder card. The drive commanded speed, but the encoder showed no movement.
Fix: Check the mechanical coupling of the encoder and the cable connection. If you are not using an encoder, ensure the Motor Control Law is not set to “Closed Loop.”

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