301
Overcurrent (AC)
Fronius · Symo Advanced Manual
What does 301 mean?
The inverter has detected an excessive current flow on the AC output side. This causes a short-term interruption of energy feeding, after which the inverter automatically attempts to restart its routine.
Common Causes
- Short circuit on the AC output or grid connection
- Severe grid disturbance or fault
- Internal inverter fault in the AC power stage
Repair Steps & Checklist
Click steps to track your progress.
- 1
If this status code keeps recurring, contact your system engineer for diagnosis.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Symo Advanced Manual