Troubleshooting
SMA Solar Technology AG
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SB11_17-IEN084820
Installation Guide
9 Troubleshooting
If the Sunny Boy displays other blink codes or display messages than described in section
6 „Commissioning“ (26), read the associated user manual in order to obtain the precise meaning of
the display messages or the blink codes and, if necessary, the error correction.
Do not undertake any repairs that are not described here, but rather use the 24-hour replacement
service (the Sunny Boy will be sent within 24 hours) and the repair service of SMA Solar Technology.
9.1 The Red LED is Continuously on
If the red LED of the status display is continuously on during operation, there is either a ground fault
in the PV generator or at least one of the varistors for the overvoltage protection is defective.
9.1.1 Checking the PV Generator for Ground Fault
1. Disconnect the Sunny Boy from both the DC and AC connections, as described in section
7.1 „Opening the Sunny Boy“ (31).
2. Measure the voltages between the plus and minus pole of a string against the ground potential.
If voltage is found, there is a ground fault in the corresponding string.
DANGER!
Risk of lethal electric shock!
In case of a ground fault, the PV generator may carry high voltages.
• Do not touch the frame of the PV generator.
• Do not touch PE.
• Wait until no voltage can be measured.
• Do not connect strings with ground faults to the Sunny Boy.
