Siemens MICROMASTER Fault Codes: Technical Reference

Siemens drives are used in many industrial applications. When a drive trips, it stops operation and displays a fault code on its BOP or AOP operator panel.

After identifying and correcting the cause and confirming that a restart is safe, the model’s documented acknowledgement methods may include:

• Cycling the supply in accordance with the model’s instructions and required discharge time.
• Using the acknowledgement function on the BOP or AOP.
• Using the configured digital acknowledgement input; digital input 3 is a default arrangement on some models and may have been changed.

Selected MICROMASTER 4-series fault codes

1. F0001 — Overcurrent

Fault acknowledgement and diagnostic records

• Use the documented power-cycle method only after correcting the cause and confirming a safe restart.
• Use the panel’s acknowledgement function where appropriate.
• Check the model-specific settings for fault acknowledgement, including P2103 and P2104 where applicable.
• P0952 concerns the stored fault count/history. Clearing history is not a repair and must not replace diagnosis of an active fault.

A recurring fault does not by itself prove hardware failure. Check the supply, load, motor, cabling, parameters and drive before deciding on repair.

Possible causes

• An output short circuit.
• An earth fault.
• Motor power outside the drive’s suitable range.
• Unsuitable parameter settings.

Checks and corrective work for qualified personnel

• Confirm that motor-cable length is within the permitted limit.
• Check the motor and cable for short circuits and earth faults using an appropriate isolated test procedure.
• Check the motor data and stator-resistance parameter P0350 where applicable.
• Check for a jammed shaft or excessive mechanical load.
• Review acceleration time and adjust only within the application’s safe operating requirements.
• Review motor–drive sizing; changing motor size requires an application assessment.

2. F0002 — Overvoltage

Possible causes

• DC-link voltage above the permitted threshold.
• Excessive supply voltage or regenerative energy during deceleration or driven-load operation.

Checks and corrective work

• Check supply voltage and the applicable P0210 setting.
• Review the DC-link voltage controller configuration for the model.
• Review ramp-down and OFF3 ramp-down settings, including P1121 and P1135 where applicable.
• Investigate any accompanying insulation or earth-fault indication.
• Check the braking arrangement, ratings and related settings, including the braking resistor where fitted.

3. F0003 — Undervoltage

Possible causes

• A mains-supply failure or voltage dip.
• A sudden load outside the specified limits.
• A hardware problem requiring diagnosis.

Checks and corrective work

• Check supply voltage, stability and quality.
• If supply and installation checks do not explain the fault, arrange qualified hardware diagnosis.

4. F0004 — Drive overtemperature

Possible causes

• Inadequate cooling.
• Excessive ambient temperature.
• Excessive internal temperature. Read r0037 as applicable; P0292 defines the difference between warning and trip temperatures, not a freely adjustable trip limit.

Checks and corrective work

• Check cooling-fan operation against the model’s control sequence.
• Check that switching frequency is within the permitted range for the load and conditions.
• Check ambient temperature against the equipment limits.
• Review load and restore adequate cooling.
• Additional diagnostics for applicable FX and GX frame sizes
  • r0949 = 1: rectifier overtemperature.
  • r0949 = 2: excessive ambient temperature.
  • r0949 = 3: EBOX overtemperature.

5. F0005 — Drive I²t overload

Possible causes

• Drive overload.
• A demanding duty cycle, including rapid repeated speed changes or reversals.
• A motor rating incompatible with the drive.
• The calculated overload limit has been reached.

Checks and corrective work

• Review the duty cycle and acceleration and deceleration times.
• Check motor and drive rating compatibility.

6. F0011 — Motor overtemperature

Possible cause

• Motor overload.

Checks and corrective work

• Review the duty cycle.
• Check relevant thermal parameters, including P0626–P0628 where applicable.
• Check that the motor warning-temperature setting P0604 is appropriate.
• Check for excessive voltage boost or operation at a frequency too low for the required load and cooling.
• Check motor cooling conditions.

7. F0012 — Drive temperature-sensor signal lost

Possible cause: a fault in the drive’s temperature-sensing circuit.

Qualified personnel should inspect the sensor circuit and connections using the model-specific service instructions.

8. F0015 — Motor temperature-sensor fault

Possible cause: an open circuit or short circuit in the motor temperature-sensing circuit.

Check the sensor type, configuration, wiring and connections.

9. F0020 — Input phase loss

Read the associated diagnostics and follow the model-specific acknowledgement procedure.

Possible cause: loss of one input phase.

Qualified personnel should inspect the incoming supply and three-phase connections after safe isolation.

10. F0021 — Earth fault

On applicable models, this diagnostic monitors an imbalance in the sum of the phase currents. The original reference describes a threshold above 5% of rated drive current for certain three-current-transformer configurations in frame sizes D–F; confirm applicability in the specific manual.

11. F0022 — Power-stack fault

Possible causes include:

• DC-link overcurrent or an IGBT short circuit.
• A braking-circuit short circuit.
• An earth fault.
• An incorrectly fitted I/O board.

First establish whether the fault is persistent or intermittent, and retain the diagnostic information.

For a persistent fault:

• Check that the I/O board is correctly installed.
• Arrange qualified inspection for output or power-stage short circuits and earth faults.

For an intermittent fault, investigate conditions that can produce excessive current:

• A sudden load change or mechanical jam.
• An acceleration time that is too short.
• Unsuitable tuning in vector-control mode.
• A braking resistance below the permitted value, where a braking resistor is used.

12. F0023 — Output fault

Possible cause: an output connection is missing on an applicable configuration.

Check output connections using the model-specific documentation and safe isolation procedure.

13. F0024 — Rectifier overtemperature

Possible causes

• Insufficient ventilation.
• A failed or non-operating fan.
• Excessive operating temperature.

Checks and corrective work

• Check the cooling fan against the model’s specified operating sequence.
• Review switching-frequency settings against the manufacturer’s instructions.
• Confirm that ambient temperature is within the permitted range.

14. F0030 — Fan fault

Possible cause: the fan is no longer operating correctly.

Have qualified personnel inspect and repair or replace the fan with a suitable part.

These are selected fault descriptions, not a complete service manual. Always use the documentation for the exact drive model, rating and firmware.

Technical references

Siemens — MICROMASTER 440 operating instructions

Siemens — compact instructions and thermal protection