SMA SUNNY BOY - Manual (Page 19)

SMA Solar Technology AG Operating Modes
User Manual SB_SMC-BEN092840 19
3.4.5 The yellow LED blinks 3 times
Grid impedance
The yellow fault LED lights up for 5 seconds when the fault occurs, and then starts emitting the
following blink code. 3 seconds off and then 3 brief consecutive blinks. This code is emitted 3 times
in succession. If this fault is still present, the fault signal starts over again.
The inverter has detected a failure relating to unacceptable grid impedance values. If the inverter
frequently displays this fault and switches off during grid monitoring, the cause may be that grid
impedance is too high.
Your installer should be able to correct this problem by increasing the cross-section of the power line.
In some cases, tightening the terminal clamps on the connection cable can also help. Other measures
can also be taken to correct this fault, but they require the explicit agreement and cooperation of the
utility operator.
Correction of error by installer
Contact your installer, who will open the inverter, as described in the inverter installation
guide, and check the AC connection.