Siemens SINAMICS drives are the backbone of European and American industrial automation — from the compact V20 to the modular S120 multi-axis system. When a SINAMICS drive shows an F-code (fault) or A-code (alarm) on the BOP or IOP display, understanding the root cause is essential to minimizing downtime. This guide covers the most common SINAMICS fault codes across the G120, G120C, S120, and V20 families.

Looking for the G120 specifically? Our Siemens G120 fault codes guide covers the G120, G120C, G120X and G120P in depth, including the F7801 and F30xxx families. This page is the overview across the wider SINAMICS range.

How SINAMICS Fault Codes Work

Siemens uses a standardized numbering system across all SINAMICS platforms:

Fxxxxx — Faults: Drive stops immediately. Must be acknowledged (reset) after the cause is resolved.
Axxxxx — Alarms: Warning conditions. Drive continues running but may reduce performance.

Faults are displayed on the BOP (Basic Operator Panel), IOP (Intelligent Operator Panel), or read via PROFINET/PROFIBUS using parameter r0945 (fault code) and r0949 (fault value).

Which guide covers your fault code

SINAMICS drives report faults as five-digit codes — F07801, F30001 and similar — not as short three-digit numbers. If your display shows a short code, you are most likely looking at a MICROMASTER or an older Siemens inverter, not a SINAMICS.

For the code lists themselves, use the model-specific guides: SINAMICS G120, G120C, G120X and G120P, or SINAMICS S120. This page stays as an overview of the family and how the drives are built.

When to Troubleshoot vs. When to Send for Repair

Fix these yourself: F004 (ramp time), F011 (cooling/load), F035 (replace fan), F040 (re-tune)

These need component-level repair: F001 with good motor (IGBT), F005 with stable power (capacitors), F030 (power module), F052 (EEPROM)

Siemens SINAMICS Repair at Flexa Systems

We repair all SINAMICS platforms — G120, G120C, G130, G150, S120, S150, V20, and legacy MicroMaster 420/430/440. Component-level repair on power modules, control units, and communication boards.

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Related Resources

This article is general reference information, not official manufacturer documentation. It does not replace the manufacturer’s manuals, wiring diagrams or safety instructions. Fault codes and procedures vary by model, catalog number and firmware revision — always verify against the current documentation for your specific unit, and follow your site’s electrical safety and lockout/tagout procedures. Allen-Bradley, PowerFlex, and Kinetix are registered trademarks of Rockwell Automation, Inc. Siemens, SIMATIC, and SINAMICS are trademarks of Siemens AG. All product names are used for identification purposes only. Flexa Systems LLC is an independent repair company and is not affiliated with, endorsed by, or authorized by these manufacturers.