Fronius Symo Hybrid Inverter Code 303 — DC module overtemperature (PV)

What does 303 mean?

The DC module (PV side) of the inverter has detected an excessively high temperature. This causes a short-term interruption in feeding energy, and the inverter will attempt to restart.

• Blocked cooling air openings
• Accumulation of dust or debris on heat sink
• High ambient temperature
• Inverter location with insufficient ventilation

Click steps to track your progress.

1. 1

   Purge the cooling air openings of the inverter to remove any blockages.

2. 2

   Clean the heat sink to ensure proper heat dissipation.

3. 3

   If this status code keeps recurring, contact your system fitter to check ventilation and inverter placement.