103

AC voltage too low

Fronius · Solar Energy

What does 103 mean?

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

Common Causes

  • Insufficient 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

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

Related Faults