- Error code
- FacFast
- Category
- Grid frequency
- Manufacturer
- SMA
- Models
- Sunny Boy (SB)
1What the error means
Fast change in grid frequency: the frequency changed faster than the permitted limit and the inverter disconnected, as protection against islanding.
2Possible causes
- Sudden grid outages or changes
- Weak grid or operation on a generator
3What to do
- It is usually transient and the inverter reconnects on its own.
- If it recurs constantly, check the measuring circuit.
4Repair by Aineas
You send the inverter to our lab in Thessaloniki. We diagnose it, inform you of the fault and the cost, and the repair starts only after you approve it. Every inverter is tested under simulated operating conditions before delivery.