102

AC voltage too high

Fronius · Solar Energy

What does 102 mean?

The AC voltage from the public grid is detected as excessively high. The inverter temporarily disconnects from the grid and will resume feeding energy once grid conditions return to the permissible range.

Common Causes

  • Excessively high AC voltage 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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