Displays and Messages SMA America, LLC
68 SB50US-80US-eng-IUS112633 Installation Guide
Grid Failure
The yellow LED lights up for 5 seconds, goes out for 3 seconds, then flashes 2 times. This sequence is
repeated 3 times. As long as a grid failure continues to be present, this flashing code will repeat itself.
The flashing code can be caused by one of the following conditions:
• Grid undervoltage (< Vac Min).
• Grid overvoltage (> Vac Max).
• Grid underfrequency (< fac Min).
• Grid overfrequency (> fac Max).
• Sudden change in the power frequency or the grid voltage.
Monitor the status of the power distribution grid at the AC terminal blocks in the Sunny Boy and the
AC disconnect switch between the Sunny Boy and the power distribution grid.
DANGER
Danger to life due to high voltages in the inverter.
Risk of death or serious injury due to electric shock.
• Only qualified personnel may perform work on the inverter.
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