304

AC module overtemperature

Fronius · Symo Advanced Manual

What does 304 mean?

The AC power module within the inverter has exceeded its safe operating temperature. This causes a short-term interruption in energy feeding, and the inverter will then attempt to resume operation once the temperature drops.

Common Causes

  • Restricted airflow to the inverter's cooling elements
  • Accumulation of dust or debris on cooling air openings or heat sink
  • High ambient temperature exceeding inverter specifications

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If this status code keeps recurring, contact your system engineer for diagnosis.

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

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Source: Fronius Symo Advanced Manual