SMA SUNNY BOY 3600TL - Page 82

12 Troubleshooting SMA Solar Technology AG
82 SB30-50TL-21-IA-en-21 Installation Manual
7401 Varistor defective At least 1 of the thermally monitored varistors is defective.
The inverter is no longer protected against overvoltage. The
inverter continues feeding into the electricity grid.
Corrective measures:
• Check varistors (see Section12.6 "Checking the Function
of the Varistors", page86).
7508 External fan fault The fan is clogged or defective. The inverter may reduce its
power output due to overheating. The inverter continues feeding
into the electricity grid.
Corrective measures:
• Clean the fan
•Replace the fan
Replace fan
7701 to
7703
Self diagnosis Internal device fault. The inverter disconnects from the electricity
grid.
Corrective measures:
• Contact the SMA Service Line (see Section16 "Contact",
page114).
Interference
device
8001 Derating occurred The power supplied by the inverter has been reduced to below
nominal power for more than 10 minutes due to overheating.
Corrective measures:
If this event occurs frequently:
• Ensure sufficient ventilation.
• Check heat dissipation (see Section10.2 "Checking Heat
Dissipation", page69).
8101 to
8104
Comm. disturbed A fault has occurred in the internal communication of the
inverter. The inverter continues feeding into the electricity grid.
Corrective measures:
• Contact the SMA Service Line (see Section16 "Contact",
page114).
Event no. Message Cause and corrective measures