- Error code
- FS 87 – FS 89
- Category
- AC overcurrent
- Manufacturer
- KACO
1What the error means
The current on one conductor is too high. An internal protection mechanism disconnected the device. The three codes correspond to the three phases.
On the display or in the monitoring software it appears as FS 87 – FS 89.
2Possible causes
- Sudden change or short circuit on the grid
- Fault in the power bridge
3What to do
- Check the AC connection and the grid.
- If it returns with no external cause, the power stage needs to be checked in our lab.
Codes covered
This fault appears with the codes FS 87 – FS 89. The manufacturer documents them as a single fault — the number indicates the stage or the phase in which it was detected.
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.