SMA Solar Technology AG
Installation Guide SB50US-80US-IUS094030 87
8.2 Error Messages
If a fault occurs, the Sunny Boy generates an error code according to the operating mode and the
detected fault.
Error Type Error Code Description
Disturbance Bfr-Srr Communication between micro-controllers is
failing
Warning Derating The inverter reduces the output power due to high
internal temperature.
Error EarthCurMax-B BFR-earth current between PV+ and GND is out
of tolerable range
Error EarthCurMax-S SRR-earth current between PV+ and GND is out
of tolerable range
Disturbance EEPROM Transition failure during reading or writing of
data EEPROM, the data is not essential for safe
operation - this failure does not effect
performance.
Error EEPROM p Data EEPROM defective, device is set to
permanent disable due to the fact that the data
loss affects important functions of the inverter.
Contact SMA.
Disturbance EeRestore Internal failure
Disturbance Fac-Bfr, Fac-Srr The AC grid frequency is exceeding the
allowable range. (“Bfr“ or “Srr“ is an internal
message and is not important to the user.) The
Sunny Boy assumes that the public grid is down
and disconnects from the grid in order to avoid
islanding.
If the grid frequency is within the tolerable range
and you still observe the failure message “Fac-
Bfr“ or “Fac-Srr“ contact SMA.
Warning GFDI Fuse Open The GFDI-Fuse is open or cleared. Check PV
array for ground faults before replacing the fuse.
Disturbance Grid-Timeout,
Grid-Fault-S
The type of grid could not be detected (208/
240/277 V). In case you are connecting to the
277 V grid, check up if the cables for L1 and N
are in the correct position.
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