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
If this status code keeps recurring, contact your system engineer for diagnosis.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Symo Advanced Manual