Power stage set problem

What does 437 mean?

This code indicates a general problem with the inverter's power stage set. This critical component is responsible for power conversion and grid interaction, and a problem here will prevent the inverter from feeding energy into the grid.

• Failure of power semiconductors (e.g., IGBTs) in the power stage.
• Damage to internal power stage components or control circuitry.
• Overload or stress on the power stage.

Click steps to track your progress.

1. 1

   If the status code is displayed continuously, notify a Fronius-trained service engineer for in-depth diagnosis and repair of the power stage.

2. 2

   Perform an AC reset to rule out transient errors in the power stage control.

3. 3

   Verify that the connected PV array size and load conditions are within the inverter's specified operational limits.