- Error code
- FS 73
- Category
- Grid fault
- Manufacturer
- KACO
1What the error means
Islanding detected (standalone mode): the inverter recognised that the grid section it feeds into has been cut off and disconnected immediately, as safety requires.
On the display or in the monitoring software it appears as FS 73.
2Possible causes
- Grid outage or instability
- Tripped fuse or RCD, or lost phase
- Loose AC connection
- Wrong grid parameters
3What to do
- Check the fuses, the RCD and the AC switch.
- Check the AC cable connections.
- Confirm that the correct country setting is selected.
- If it recurs with no obvious cause on the grid, the inverter needs to be checked.
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.