Fronius Symo Hybrid Inverter Code 522 — DC low (PV), No PV voltage available

What does 522 mean?

A warning message on the display indicates that the DC voltage from the photovoltaic (PV) modules is too low or unavailable. For hybrid systems, this message can appear normally overnight or in standby mode.

• Insufficient solar insolation (e.g., night, heavily cloudy day)
• Disconnected PV string or module
• Faulty PV string or module

Click steps to track your progress.

1. 1

   Acknowledge the status code on the display.

2. 2

   Observe if the voltage returns during daylight hours with sufficient sun.

3. 3

   If the status code is displayed all the time during daylight, notify a Fronius-trained service engineer.