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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

102AC voltage too high103AC voltage too low105AC frequency too high
Source: Fronius Symo Advanced Manual
Open Manual (Page 42)Search more codes in this manual