SMA America, LLC
Displays and Messages
Installation Guide
SB50US-80US-eng-IUS112633
67
Cleared GFDI Fuse
The GFDI fuse was cleared or is not present. This fuse protects the PV plant if a ground fault is present
in the PV array.
Check the PV array for ground fault errors before replacing this fuse. It is located in the fuse holder
on the inverter board.
Control System Fault
The yellow LED is continuously lit up. The Sunny Boy has detected a fault within the internal monitoring
system.
If the inverter detects this kind of fault, it will no longer feed into the power distribution grid. The inverter
must be maintained by a qualified service technician. Contact SMA.
CAUTION
Risk of fire due to incorrectly dimensioned fuse.
Risk of injury due to fire.
• Only replace faulty fuses with fuses of the same type and size.
• The Sunny Boy is shipped with a Littelfuse KLKD 1 Amp, 600 V AC/DC type fuse.