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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.

103

AC voltage too low

Fronius · Symo Advanced Manual

What does 103 mean?

The inverter has detected that the AC voltage from the public grid is below permissible limits. The inverter disconnects from the grid and will resume operation once the voltage stabilizes within the acceptable range after a monitoring period.

Common Causes

  • Public grid voltage sag or under-voltage condition
  • Heavy load transients on the local grid affecting voltage stability

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    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

102AC voltage too high105AC frequency too high106AC frequency too low
Source: Fronius Symo Advanced Manual
Open Manual (Page 41)Search more codes in this manual