SMA Solar Technology AG
11 Troubleshooting
Installation Manual
STP5-9TL-IA-en-10
77
7001 …
7002
Sensor fault fan
permanently on
The cause must be determined by the SMA Service
Line.
Corrective measures:
• Contact the SMA Service Line.
7401
Varistor defective
At least one of the thermally monitored varistors is
defective.
Corrective measures:
• Check the function of the varistors
(see Section 11.6).
7701 …
7703
Self diagnosis
Interference device
The cause must be determined by the SMA Service
Line.
Corrective measures:
• Contact the SMA Service Line.
8001
Derating occurred
The inverter has reduced its power output for more than
ten minutes due to an excessive temperature.
Corrective measures:
• If this message is displayed frequently, clean the
fans (see Section 11.8).
• Ensure that the inverter has sufficient ventilation.
8101 …
8104
Comm. disturbed
The cause must be determined by the SMA Service
Line.
Corrective measures:
• Contact the SMA Service Line.
Event
number
Display message
Cause and corrective measures