Siemens S120 Error Codes is the system-level entry point for narrowing SINAMICS S120 faults before you commit to a single code page. Use it to separate thermal, DC link, and operating-state symptoms while the fault path is still being framed.
This page is most useful when the drive family is known but the exact root cause is not. Start with system-level checks, move into the most likely fault group, then open the closest code page with enough context to troubleshoot efficiently.
Code library
3
Critical
2
Warning
1
Primary pattern
Thermal + DC link
Use this section to confirm what this error system covers, which device families it typically appears in, and how the main fault families are grouped before you move into individual codes.
Platforms
Device families
Applies to
Motor-side thermal stress
Use this group when the motor load, thermal sensor path, or ambient conditions are stronger suspects than the power stage itself.
Power unit thermal stress
Use this group when airflow, fan health, cabinet temperature, or module cooling limitations are more plausible than motor-only overload.
DC link and regenerative energy
Use this group when deceleration ramps, braking resistor sizing, or overvoltage protection are the likely fault path.
Use these system-level checks first when the exact code is not yet confirmed. The goal is to narrow the failure path before you open a specific code page.
First check 1
Separate faults that appear at standstill, acceleration, steady load, and deceleration. This is often the fastest way to distinguish between thermal build-up and DC link or braking-related events.
Signals to confirm
Next move
Use the operating moment to choose the closest fault group before opening individual code pages.
First check 2
Check cabinet heat, airflow, fan status, motor current, and thermal model assumptions before treating a thermal code as a hardware failure.
Signals to confirm
Next move
If heat, load, or cooling are leading clues, start with F07011 and F30005.
First check 3
If the trip appears during ramp-down or fast regenerative events, review braking resistor sizing, deceleration ramps, and DC link protection thresholds before replacing parts.
Signals to confirm
Next move
If deceleration and regen behavior dominate, start with F30021.
These groups help you translate a broad symptom into a smaller fault family, then move into the closest representative codes.
Fault group
Use this group when the motor load, thermal sensor path, or ambient conditions are stronger suspects than the power stage itself.
Common symptoms
Fault group
Use this group when airflow, fan health, cabinet temperature, or module cooling limitations are more plausible than motor-only overload.
Common symptoms
Fault group
Use this group when deceleration ramps, braking resistor sizing, or overvoltage protection are the likely fault path.
Common symptoms
Use these curated entry points when you need a fast shortlist before working through the full code browser.
Use these as the fastest entry points when the system has not yet been narrowed to a single failure path.
F07011
criticalMotor Overtemperature
Motor temperature has exceeded the permissible limit. Immediate analysis is recommended to prevent thermal damage.
F30005
criticalPower Unit Overtemperature
The power module exceeded allowable temperature limits.
F30021
warningPower Unit DC Link Overvoltage
DC link voltage exceeded the configured protection threshold.
These codes usually deserve faster attention because they are more disruptive or more likely to hide upstream system issues.
Once the operating context and likely fault group are clear, use the full browser below to search, filter, and compare the closest Siemens S120 error codes in one place.
Use these guides, tools, and reference materials once the fault path is narrowed and you need to verify the next move.
Control Panel Heat Load & Cooling Calculator
Control Panel Heat Load & Cooling Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.
Motor Full-Load Current Calculator
Motor Full-Load Current Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.
Motor Overload Relay Setting Calculator
Motor Overload Relay Setting Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.
These answers cover the system-level questions that usually come up before or during code-by-code troubleshooting.
Next step
Send the active code, operating moment, load condition, and the checks already completed so the diagnosis can move faster from symptom to root cause.
