Troubleshooting SMA America, LLC
78 SB50US-80US-IA-en-36 Installation Manual
Interference Fac-Ocu, Fac-Srr The AC power frequency is exceeding the
permissible range. To prevent islanding, the
Sunny Boy disconnects itself from the power
distribution grid.
If the power frequency is within the tolerable
range and the error message "Fac-Ocu" or "Fac-
Srr" continues to be displayed, contact SMA.
Warning GFDI Fuse Open The GFDI fuse is cleared. Before replacing the
fuse, check the PV array for a ground fault error.
Interference Grid-Timeout, Grid-
Fault-S
The system configuration cannot be detected
(208 V/240 V/277 V).
If a 277 V grid is configured: Check whether the
cables for L1 and N are located in the correct
connection terminals.
Interference Imax Overcurrent on the AC side. The current to the AC
grid exceeds the guidelines. The reason for this
may be severe grid interference. If "Imax"
appears frequently, check the AC grid. If you
require help, contact SMA.
Interference K1-Close Relay test failed. Contact SMA.
Error K1-Open, K2-Open
Interference MSD-FAC, MSD-Idif Internal measurement comparison fault:
The OCU and SRR values measured by the Sunny
Boy differ too strongly from one another.
Contact SMA.
Error MSD-VAC
Interference OFFSET Grid monitoring self-test failed.
Error ROM The internal test of the Sunny Boy control system
firmware failed. If this fault occurs frequently,
contact SMA.
Interference Shut-Down Continuous internal overcurrent.
Interference Vac-Ocu, Vac-Srr The AC grid voltage is exceeding the permissible
range. The cause may be disconnection from the
power distribution grid or from an AC cable. To
prevent islanding, the Sunny Boy disconnects
itself from the power distribution grid.
If the error message "Vac-Ocu" or "Vac-Srr" is
displayed despite the grid voltage being within
the tolerable range, contact SMA.
Error type Error code Description
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