SMA America, LLC
Displays and Messages
Installation Guide
SB50US-80US-eng-IUS112633
63
The red LED indicates the status of the GFDI fuse, located
inside the Sunny Boy. If this LED lights up, the GFDI fuse
has cleared or is not present.
The inverter does not feed into the power distribution grid.
The yellow LED indicates that there is a fault in either the
inverter or the PV plant. The inverter will not operate until
the fault has been corrected.
The possible error messages and causes are explained
later in this section and in section 9 ”Troubleshooting”
(page 77).
The red and yellow LEDs combined indicate that the
inverter has detected a ground fault. The ground fault must
be located and cleared and the inverter reset manually.
The inverter will not restart automatically after detecting a
ground fault. The ground fault may also trip the GFDI fuse.
In turbine mode, all GFDI fuses are suspended.