105

AC frequency too high

Fronius · Solar Energy

What does 105 mean?

The AC grid frequency is detected as excessively high. The inverter temporarily disconnects from the grid according to safety standards and will resume operation once the frequency returns to the permissible range.

Common Causes

  • Excessively high AC frequency from the public grid
  • Poor grid connection quality

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all AC grid connections at the inverter and point of common coupling

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Verified technical data. Last updated: March 2026

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Fronius Error 105: AC frequency too high — Troubleshooting Guide | ErrorLib