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: March 2026

Related Faults

Source: Fronius Symo Advanced Manual