- Error code
- FS 33
- Category
- DC current at the output
- Manufacturer
- KACO
1What the error means
DC injection exceeded the permitted value. The manual notes that it may be due to grid conditions and not necessarily a fault.
On the display or in the monitoring software it appears as FS 33.
2Possible causes
- Fault in the power bridge
- Fault in the current measuring circuit
3What to do
- Restart once.
- If it returns, repair is required — the standard does not allow operation with DC current fed into the grid.
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.