Troubleshooting SMA America, LLC
78 SB30-40US-IUS103030 Installation Guide
9.2 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.
Contact SMA for assistance.
Warning Derating The inverter reduces the output power due to high
internal temperature. Verify that the fans are
operating normally and that the intake screens are
clean. Check the intake vents for debris. Verify that
there is adequate ventilation around the inverter. This
condition may be normal in periods of high ambient
temperatures above +113 °F (+45°C).
Error EarthCurMax-B The earth current between PV+ and GND has
exceeded the maximum limit. Check the PV array for
ground faults.
Error EarthCurMax-S The earth current between PV+ and GND has
exceeded the maximum limit. Check the PV array for
groud faults.
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“, check for possible intermittent connections.
For additional assistance 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
(208V/240V).
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