LS iE5 Fault Codes List

Troubleshoot your LS iE5 micro-inverter with our updated guide. Learn to interpret OCT, OVT, and LVT trips, access trip history via the H-group, and reset the drive safely.

LS iE5 Fault Codes Reference Table

Below is the complete list of protective functions and alarm codes. Please refer to this table to match the code on your LED display with the specific diagnostic remedy.

LS iE5 Fault Codes List

LS iE5 Fault Codes List

Fault Code and Meaning Cause and Remedy
OCt

Overcurrent		 Cause:
  • Accel/Decel time is too short compared to the inertia of the load (GD²).
  • Load is greater than the inverter rating.
  • Inverter output is issued when the motor is free running.
  • Output short circuit or ground fault has occurred.
  • Mechanical brake of the motor is operating too fast.

Remedy:
  • Increase the Accel/Decel time.
  • Replace the inverter with appropriate capacity.
  • Resume operation after stopping the motor or use P36 (Speed search).
  • Check output wiring.
  • Check the mechanical brake.
GFt / GCt

Ground fault current		 Cause:
  • Ground fault has occurred at the output wiring of the inverter.
  • The insulation of the motor is damaged due to heat.

Remedy:
  • Check the wiring of the output terminal.
  • Replace the motor.
IOL / OLt

Inverter overload / Overload trip		 Cause:
  • Load is greater than the inverter rating.
  • Torque boost scale is set too large.

Remedy:
  • Upgrade the capacity of motor and inverter or reduce the load weight.
  • Reduce torque boost scale.
OHt

Inverter overheat		 Cause:
  • Cooling system has faults.
  • Ambient temperature is too high.

Remedy:
  • Check for alien substances clogged in the heat sink.
  • Keep ambient temperature under 40°C.
COL

Condenser overload		 Cause:
  • 3-Phase product may have one phase lost.
  • Internal condenser was outworn.

Remedy:
  • Check whether wiring of input power or inter-phase voltage is abnormal.
  • It’s almost time to replace or it may happen when it is used in hot temperature for a long while. Contact after-sales service.
POt

Output Phase loss		 Cause:
  • Faulty contact of magnetic switch at output.
  • Faulty output wiring.

Remedy:
  • Make connection of magnetic switch at output of the inverter securely.
  • Check output wiring.
OUt

Over voltage		 Cause:
  • Decel time is too short compared to the inertia of the load (GD²).
  • Regenerative load is at the inverter output.
  • Line voltage is too high.

Remedy:
  • Increase the Decel time.
  • Check whether line voltage exceeds its rating.
LUt

Low voltage		 Cause:
  • Line voltage is low.
  • Load larger than line capacity is connected to line (ex: welding machine, motor’s direct input).
  • Faulty magnetic switch at the input side of the inverter.

Remedy:
  • Check whether line voltage is below its rating.
  • Check the incoming AC line. Adjust the line capacity corresponding to the load.
  • Change a magnetic switch.
EtA / EtB

External fault A / B contact input		 Cause:
  • The multi function terminals (P66 ~ P70) set to “18 (External fault-A)” or “19 (External trip signal input : fault-B)” in P66~P70 in PG Group is ON.

Remedy:
  • Eliminate the cause of fault at circuit connected to external fault terminal or cause of external fault input.
_ _ _ L

Lost Command		 Cause:
  • No frequency command is applied to AI terminal.
  • Communication command is cut off.

Remedy:
  • Check the wiring of AI and frequency reference level.
  • In case of a program set to periodically update frequency, check the communication line or operation of master device.
EEP / HUt

Parameter save error / Hardware fault		 Cause:
  • Hardware fault or First power-on after software upgrade.

Remedy:
  • Contact your local LSIS sales representative.
  • EEP message occurs when first allowing power after upgrading software due to A/S service. At the moment, turn it off and retry.
 

How to Read iE5 Faults via the Keypad

The iE5 is designed for quick, manual diagnostics. In 2026, the primary way to troubleshoot this micro-drive is through the integrated keypad and its monitoring functions:

  • Current Fault Indication: When a trip occurs, the display automatically alternates between the fault name (e.g., OCT) and the output frequency at the time of the trip.
  • Fault History (H1 to H5): The iE5 maintains a record of the last 5 trips. Navigate to the H (Function Group 2) group. Parameters H 1 through H 5 display the most recent to the oldest faults.
  • Fault Detail: While viewing a fault in the H-group, pressing the ENT key will show the operating state (accelerating, decelerating, or constant speed) and frequency when the trip happened.

General Troubleshooting Steps

Because the iE5 is often used in tight enclosures with small motors, perform these checks before resetting a major trip:

  1. Overcurrent (OCT): Check if the motor is jammed or if the acceleration time (Parameter ACC) is too fast for the load. Also, ensure the motor leads are not touching the metal chassis (ground fault).
  2. Overload (ETH): The iE5 uses electronic thermal protection. Verify that parameter H33 (Motor Rated Current) is set according to the motor’s nameplate. Since micro-motors have little heat capacity, this setting is critical.
  3. Low Voltage (LVT): Check your input power stability. Because the iE5 is a micro-drive, it is particularly sensitive to voltage drops caused by other equipment starting on the same single-phase line.

Frequently Asked Questions (FAQ)

Q: What is the difference between “OVT” and “OCT”?

A: OVT (Overvoltage Trip) is caused by the DC link voltage rising too high, usually during deceleration when the motor acts as a generator. OCT (Overcurrent Trip) is caused by an electrical spike, usually due to a short circuit or a mechanical jam.

Q: How do I reset a fault on the LS iE5?

A: After solving the root cause, you can clear the trip by:

  • Pressing the STOP/RESET key on the keypad.
  • Activating the digital input programmed for RST (Reset).
  • Cycling the input power (Turn the power OFF, wait for the LED display to go completely blank, then Turn ON).

Q: Why does the drive display “Pot”?

A: Pot is not an error code. It indicates that the drive is set to Potentiometer Mode, meaning it is looking for a frequency speed reference from the dial on the front of the unit.

Q: Can the iE5 handle a braking resistor?

A: Most standard iE5 models do not have built-in braking transistors or terminals for an external braking resistor. If you are experiencing constant OVT trips, you must increase the Deceleration Time (Parameter dEC).

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