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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.

102

AC voltage too high

Fronius · Symo Advanced Manual

What does 102 mean?

The inverter has detected that the AC voltage from the public grid is above permissible limits. As a safety measure, the inverter disconnects itself from the grid. It will resume feeding energy once grid conditions return to a safe range after a stipulated monitoring period.

Common Causes

  • Public grid voltage instability or overvoltage condition
  • Incorrect grid connection impedance causing localized voltage rise

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all grid connections for proper termination and secure fit.

  2. 2

    If this status code keeps recurring, contact your system engineer for further grid analysis.

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

Related Faults

103AC voltage too low105AC frequency too high106AC frequency too low
Source: Fronius Symo Advanced Manual
Open Manual (Page 41)Search more codes in this manual