Troubleshooting Error Messages
8-4 SMA America SB3000US-4000US-11-SE1607
Disturbance K1-Close Relay test failed. Contact SMA for assistance.
Error K1-Open
Disturbance MSD-FAC
MSD-Idif
Internal measurement comparison error: The internal BFS
and SRR processors are measuring different values. Con-
tact SMA for assistance.
Error MSD-VAC
Disturbance OFFSET Grid monitoring self-test failed. Contact SMA for assis-
tance.
Error ROM The internal test of the Sunny Boy control system firmware
failed. Contact SMA for assistance.
Disturbance Shut-Down Internal over current continuous. Contact SMA for assis-
tance.
Disturbance Vac-Bfr
Vac-Srr
The AC grid voltage is exceeding the allowable range.
(“Bfr“ or “Srr“ is an internal message and is not important
for the user.) Vac can also result from a disconnected grid
or a disconnected AC wire. The Sunny Boy assumes that
the utility grid is down and disconnects to prevent island
-
ing.
If the grid voltage is within the tolerable range and you still
observe the failure message “Vac-Bfr“ or “Vac-Srr“ contact
SMA America.
Disturbance VacL1-Bfr
VacL2-Bfr
VacL1-Srr
VacL2-Srr
Voltage is too high or too low on the indicated leg.
Disturbance VpvMax
!PV Overvoltage!
!Disconnect DC!
DC input voltage above the maximum allowable limit.
Disconnect DC immediately!
Disturbance Watchdog Watchdog for operation control triggered. Contact SMA
for assistance.
Disturbance XFMR_TEMP_F High transformer temperature. The inverter will remain
stopped until the transformer has cooled.
Warning XFMR_TEMP_W High transformer temperature is gone. The Sunny Boy
starts working and shows the failure “XFMR_TEMP_W“.
Verify that the fans are operating normally and that the in
-
take screens are clean. Check the intake vents for debris.
Verify that there is adequate ventilation around the invert
-
er. This condition may be normal in periods of high ambi-
ent temperatures (above 45°).
Error Type Error Code Description
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