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. 1

    If this status code keeps recurring, contact your system engineer for diagnosis.

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Verified technical data. Last updated: March 2026

Related Faults

Source: Fronius Symo Advanced Manual