LS iP5A Fault Codes List

Troubleshoot your LS iP5A (Starvert) Fan & Pump VFD with our updated guide. Learn to interpret OCT, OVT, and GFT trips, use DriveView 9 for diagnostics, and reset faults.

LS iP5A 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 LCD display with the specific hardware or mechanical issue affecting your pump or fan.

LS iP5A Fault Codes List

LS iP5A Fault Codes List

Fault Code and Meaning Cause and Remedy
Over Current 1

The inverter turns off its output when the output current of the inverter flows more than 200% of the inverter rated current. 		Cause:
  • Acceleration/Deceleration time is too short compared to the GD² of the load.
  • Load is larger than the inverter rating.
  • Inverter turns output on when the motor is free running.
  • Output short or ground fault has occurred.
  • Mechanical brake of the motor is operating too fast.
  • Components of the main circuit have overheated due to a faulty cooling fan.

Remedy:
  • Increase Accel/Decel time.
  • Increase inverter capacity.
  • Operate after motor has stopped.
  • Check output wiring.
  • Check mechanical brake operation.
  • Check cooling fan.
(Caution) Operating inverter prior to correcting fault may damage the IGBT.
Ground Fault

The inverter turns off its output when a ground fault occurs and the ground fault current is more than the internal setting value. 		Cause:
  • Ground fault has occurred at the output wiring of inverter.
  • The insulation of the motor is damaged due to heat.

Remedy:
  • Investigate the output wiring of inverter.
  • Exchange motor.
Over Voltage

The inverter turns off its output if the DC voltage of the main circuit increases higher than the rated value (during deceleration or regen). 		Cause:
  • Deceleration time is too short compared to the GD² of load.
  • Regenerative load at the output.
  • Line voltage high.

Remedy:
  • Increase deceleration time.
  • Use regenerative resistor option.
  • Check line voltage.
Over Load

(Current Limit Protection). The inverter turns off its output if the output current flows at 120% of the rated current. 		Cause:
  • Load is larger than the inverter rating.
  • Incorrect inverter capacity selected.
  • Set incorrect V/F pattern.

Remedy:
  • Increase capacity of motor and inverter.
  • Select correct inverter capacity.
  • Select correct V/F pattern.
Over Heat

The inverter turns off its output if the heat sink is over heated. 		Cause:
  • Cooling fan damaged or an alien substance inserted.
  • Cooling system has faults.
  • Ambient temperature high.

Remedy:
  • Exchange cooling fans and/or eliminate alien substance.
  • Check for alien substances in the heat sink.
  • Keep ambient temperature under 40°C.
E-Thermal

(Electronic Thermal). Internal calculation determines motor overheating. Overload capacity: 130% for 1 min. 		Cause:
  • Motor has overheated.
  • Load is larger than inverter rating.
  • ETH level too low.
  • Incorrect inverter capacity selected.
  • Set incorrect V/F pattern.
  • Operated too long at low speeds.

Remedy:
  • Reduce load and/or running duty.
  • Increase inverter capacity.
  • Adjust ETH level to an appropriate level.
  • Select correct inverter capacity.
  • Select correct V/F pattern.
  • Install a cooling fan with a separate power supply.
Ext. Trip

User triggered external trip signal to stop output. 		Cause:
External Trip has occurred.

Remedy:
  • Eliminate Trip at circuit connected to external trip terminal.
  • Remove external trip input.
Low Voltage

DC voltage is below the detection level (insufficient torque or potential motor overheating). 		Cause:
  • Line voltage low.
  • Load larger than line capacity is connected to line (e.g., welding machine, large motor starting).
  • Faulty magnetic switch at the input side of the inverter.

Remedy:
  • Check line voltage.
  • Increase line capacity.
  • Exchange magnetic switch.
Over Current 2

IGBT Short or Output Short. 		Cause:
  • Short has occurred between the upper and lower IGBT.
  • Short has occurred at the output of the inverter.
  • Acceleration/Deceleration time is too short compared to the GD² of load.

Remedy:
  • Check IGBT.
  • Check output wiring of inverter.
  • Increase acceleration time.
Output Phase Open

One or more of the output (U, V, W) phases is open. 		Cause:
  • Faulty contact of magnetic switch at output.
  • Faulty output wiring.

Remedy:
  • Check magnetic switch at output of inverter.
  • Check output wiring.
BX

(Instant Cut Off). Used for emergency stop. 		Cause:
The BX terminal is turned ON.

Remedy:
  • Turn the BX terminal OFF to return to regular operation.
  • Take caution when using this function.
HW-Diag

Inverter Hardware Fault (Control circuitry error). 		Cause:
  • Wdog error (CPU fault).
  • EEP error (memory fault).
  • ADC Offset (current feedback circuit fault).
  • Input phase open.
  • NTC open.

Remedy:
  • Exchange inverter.
COM Error / CPU Error

Inverter cannot communicate with the keypad. 		Cause:
  • Faulty connection between inverter and keypad.
  • Inverter CPU malfunction.

Remedy:
  • Check connector.
  • Exchange inverter.
Inv. OLT

Inverter Overload. Output current flows more than rated level (110% for 1 min, 130% for 4 sec). 		Cause:
  • Load is larger than inverter rating.
  • Incorrect inverter capacity selected.

Remedy:
  • Increase motor and/or inverter capacity.
  • Select correct inverter capacity.
NTC open

Inverter internal NTC is opened. 		Cause:
Inverter internal NTC circuit is open/damaged.

Remedy:
  • Contact the factory or your local distributor.
LOP / LOR / LOV / LOI / LOX

Operating Method when the Speed Reference is Lost. 		Cause:
  • LOP: Loss of reference from the Option (DPRAM time out).
  • LOR: Remote communication network fault.
  • LOV: 'V1' analog frequency reference lost.
  • LOI: 'I' analog frequency reference lost.
  • LOX: Sub-board (V2, ENC) analog frequency reference lost.

Remedy:
  • Eliminate cause of fault (check connections/signals).
 

How to Read iP5A Faults via DriveView 9

The LS iP5A is often integrated into complex BMS (Building Management Systems). In 2026, the standard for professional maintenance involves using DriveView 9 software or the drive’s built-in “Monitor” functions:

  • Fault History (H1 to H5): The iP5A stores the last 5 trips. To access these via the keypad, navigate to Function Group 2 (H-group). Parameters H 1 through H 5 display the most recent to the oldest faults.
  • Detailed Trip Data: When viewing a fault in the H-group, press the ENT key. The iP5A will show the motor frequency, current, and operating state (Accel, Decel, or Constant Speed) at the exact moment the fault occurred.
  • DriveView 9 Connectivity: By connecting your PC to the drive’s communication port (RS485), you can use DriveView 9 to graph long-term performance and identify if intermittent LVT (Low Voltage) or OVT (Overvoltage) trips are occurring during specific times of day.

General Troubleshooting Steps for Fans & Pumps

Before resetting a major trip on your iP5A, perform these essential checks:

  1. Overcurrent (OCT): For large pumps, check for a “Locked Rotor” condition or debris in the impeller. For fans, ensure the motor isn’t trying to start a fan that is already “windmilling” (spinning backward) due to natural draft.
  2. Ground Fault (GFT): The iP5A is sensitive to moisture. In HVAC environments, check for condensation or water intrusion in the motor peckerhead or conduit that may be causing a path to the earth.
  3. Overload (ETH/IOL): ETH (Electronic Thermal) indicates the motor is running hot, while IOL (Inverter Overload) indicates the drive itself is over capacity. Check if pump valves are fully open or if fan dampers are stuck, causing excessive backpressure.

Frequently Asked Questions (FAQ)

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

A: OVT (Overvoltage Trip) usually happens during deceleration when the motor acts as a generator. On the iP5A, this is common with high-inertia fans; try increasing the Deceleration Time. LVT (Low Voltage Trip) occurs when the incoming line voltage drops, often due to a brownout or an undersized power transformer.

Q: How do I reset a fault on the LS iP5A?

A: Once the fault condition is cleared, you can reset the drive by:

  • Pressing the STOP/RESET key on the keypad.
  • Activating the digital input terminal assigned to the RST function (check terminals P1–P8).
  • Cycling the input power (Wait for the display to turn off completely before re-applying power).

Q: Why does my drive show “LDT”?

A: LDT (Low Duty/Low Load) is an HVAC-specific trip. It triggers when the drive detects a sudden drop in motor current, indicating a “Dry Pump” or a snapped fan belt. Check the mechanical coupling to the load.

Q: Where is the fault history located?

A: You can find the history of the last 5 faults in Function Group 2, parameters H 1, H 2, H 3, H 4, and H 5. Pressing enter on these will provide a snapshot of the drive’s electrical state at the time of the error.

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