Lenze 8200 Fault Codes – Error Messages, Causes & Troubleshooting

The Lenze 8200 Vector inverter is still found in many industrial machines and control panels. Although the range is now legacy equipment, existing installations may continue operating for many years.

When a Lenze 8200 displays a fault, identifying the error message is the first step towards understanding what has happened and determining what needs to be checked.

This guide covers common Lenze 8200 fault codes, their meanings, possible causes and troubleshooting considerations.

Important: Fault indications and available functions can vary between 8200 models and configurations. Always check the operating instructions for the exact drive type before carrying out diagnostic work.

Lenze 8200 Fault Code List

The following table summarises fault indications documented for the Lenze 8200 Vector range.

Fault code	Fault description	Fault number
EEr	External fault	—
FAn1	Fan failure	95
H05	Internal fault	105
id1	Faulty parameter identification	140
LP1	Motor phase error	32 / 182
LU	DC bus undervoltage	—
OC1	Short circuit	11
OC2	Earth fault	12
OC3	Controller overload during acceleration or short circuit	13
OC4	Controller overload during deceleration	14
OC5	Controller overload during steady-state operation	15
OC6	Motor overload	16
OH	Heatsink overtemperature	50
OH3	PTC motor temperature monitoring	53
OH4	Controller overtemperature	54
OH51	PTC motor temperature monitoring	203
OU	DC bus overvoltage	—
OUE	Overvoltage during braking operation	22

Some indications, including FAn1 and the PTC monitoring faults, are dependent on the drive model or parameter configuration.

Lenze 8200 Faults Explained

OC1 – Short Circuit

The OC1 fault indicates a short-circuit condition.

Possible causes identified in the Lenze documentation include:

A short circuit in the motor circuit.
A problem with the motor cable.
A problem with the brake resistor or its wiring.
Excessive capacitive charging current from the motor cable.

The motor cable, motor circuit and braking resistor circuit may need to be checked by a suitably qualified engineer.

OC2 – Earth Fault

OC2 indicates an earth fault involving the motor circuit.

Possible causes include:

A motor phase making contact with earth.
A fault in the motor.
A motor cable fault.
Excessive capacitive charging current from the motor cable.

The motor and associated wiring should be inspected to establish the cause.

OC3 – Controller Overload During Acceleration

OC3 indicates controller overload during acceleration, although the manufacturer's fault description also includes short circuit as a possible condition.

Possible causes include:

Acceleration time set too short.
Incorrect drive sizing for the application.
Defective motor cable.
An interturn fault in the motor.

The acceleration time is set using parameter C0012.

Increasing the acceleration time may help where the ramp is too demanding, but the motor, cable and drive selection must also be considered.

OC4 – Controller Overload During Deceleration

OC4 occurs when the controller experiences overload during deceleration.

A possible cause is a deceleration time that is too short.

The manufacturer's troubleshooting guidance identifies:

Deceleration time parameter C0013.
The selection and sizing of the external brake resistor.

Where the application requires rapid stopping, the braking arrangement and drive configuration should be checked rather than simply increasing the deceleration time without considering the machine requirements.

OC5 – Controller Overload During Steady-State Operation

OC5 indicates controller overload during steady-state operation.

The manufacturer's guidance identifies frequent or prolonged overload as a possible cause.

The drive selection and application loading should be checked to establish whether the inverter is correctly rated for the duty.

OC6 – Motor Overload

OC6 indicates motor thermal overload, associated with the drive's I²t overload monitoring.

Possible causes include:

Excessive continuous motor current.
Frequent or prolonged acceleration processes.
Incorrect drive or motor sizing for the application.

The motor loading and the relevant overload setting, including parameter C0120, should be checked.

LU – DC Bus Undervoltage

LU indicates that the DC bus voltage is too low.

Possible causes include:

Mains supply voltage too low.
Insufficient voltage in the DC bus connection.
A mismatch between the controller voltage rating and the supply voltage.

The supply voltage and power supply arrangement should be checked against the exact controller specification.

OU – DC Bus Overvoltage

OU indicates excessive DC bus voltage.

Possible causes include:

Supply voltage too high.
Voltage rise during braking or deceleration.

Where the fault occurs during braking, the deceleration time and braking arrangement should be investigated.

OH – Heatsink Overtemperature

OH indicates that the inverter heatsink temperature has exceeded its permitted operating threshold.

Possible causes include:

Excessive ambient temperature.
Dirty or obstructed heatsink.
Insufficient ventilation.
Excessive current or prolonged acceleration duty.
Mechanical problems causing the motor load to increase.

The controller should be allowed to cool, and the cooling arrangements, heatsink condition and application load should be checked.

OH4 – Controller Overtemperature

OH4 indicates that the controller is too hot internally.

The manufacturer's troubleshooting guidance identifies excessive controller loading, inadequate cooling and fan problems as possible causes.

LP1 – Motor Phase Error

LP1 indicates a motor phase error under the applicable monitoring configuration.

Possible causes include:

Failure of one or more motor phases.
Motor current being too low for the configured monitoring.
Motor supply cable problems.

The exact diagnostic meaning depends on the LP1 monitoring configuration, including parameter C0597.

FAn1 – Fan Failure

FAn1 is documented for certain 8200 motec models, specifically the 3–7.5 kW versions covered by the relevant instructions.

It indicates a fan failure or fan connection problem.

The fan and its wiring should be checked. The fault response may be configured as a TRIP or warning, depending on parameter C0608.

H05 – Internal Fault

H05 indicates an internal fault.

The manufacturer's instructions direct the user to contact Lenze for assistance.

If the fault persists, specialist assessment may be required to establish whether the drive can be repaired or whether replacement should be considered.

id1 – Faulty Parameter Identification

The id1 indication relates to faulty parameter identification.

One documented cause is that the motor is not connected during the identification process.

Check the motor connection and the applicable commissioning procedure for the drive.

Checking the Lenze 8200 Fault History

Where supported by the installed drive and keypad configuration, the 8200 provides fault-history information through the parameter set.

The documented fault-history parameters include:

Parameter	Description
C0161	Active fault
C0162	Last fault
C0163	Previous fault
C0164	Earlier fault

Fault history can help identify whether a fault is recurring and whether different fault indications have occurred.

Before clearing or resetting a fault, it is useful to record the displayed indication and any available fault-history information.

Can a Lenze 8200 Fault Be Reset?

A fault reset acknowledges the fault condition; it does not necessarily resolve the underlying problem.

If the cause remains, the drive may trip again when operation resumes.

Before attempting a reset, the fault should be identified and the relevant motor, wiring, supply, loading or cooling conditions investigated.

Electrical checks and work inside a drive or control panel should only be carried out by suitably qualified personnel, following appropriate isolation and safety procedures.

When a Lenze 8200 Fault Becomes a Replacement Issue

The Lenze 8200 is a legacy inverter range, and the availability of replacement units and components can be limited depending on the model.

Where a drive develops a persistent fault, the practical options may include:

Investigating whether the existing drive can be repaired.
Checking availability of a suitable replacement unit.
Identifying a modern inverter suitable for the motor and application.
Considering whether the existing control panel or machine requires modification.

The correct approach depends on the exact 8200 model, the fault, the motor and the machine requirements.

For further information, read our guide:

What to Do When Your Lenze 8200 or 8400 Drive Becomes Obsolete

Need Help Identifying a Lenze 8200 Fault?

Modern Drives & Controls has extensive experience with Lenze drives, including legacy equipment.

If your Lenze 8200 is displaying a fault or you are considering replacement, we can help establish the equipment details and discuss the available options.

When contacting us, it is useful to provide:

The complete Lenze drive type or model number.
The fault code displayed.
The motor rating and application.
Any relevant fault-history information.

Contact Modern Drives & Controls to discuss your Lenze 8200 drive.