Yellow LED: 5s on, 3s off, 2 blinks (repeated 3 times) - Grid failure

What does Yellow LED: 5s on, 3s off, 2 blinks (x3) mean?

This specific blinking pattern of the yellow LED indicates a grid fault condition. The pattern repeats as long as the grid fault persists, meaning the inverter cannot connect to the utility grid.

• Low grid voltage (<Vac Min)
• High grid voltage (>Vac Max)
• Low grid frequency (<fac Min)
• High grid frequency (>fac Max)
• Rapid change in grid frequency or voltage.

Click steps to track your progress.

1. 1

   Inspect the AC disconnect between the Sunny Boy and the grid to ensure it is fully closed and not tripped.

2. 2

   Verify that the public utility grid is operational and stable in your area.

3. 3

   Have a qualified professional check the condition of the grid at the AC terminal blocks within the Sunny Boy, as per safety warnings.