- Error code
- FS 98, FS 99
- Category
- Internal fault
- Manufacturer
- KACO
1What the error means
An internal protection mechanism disconnected the device completely to protect it from damage.
On the display or in the monitoring software it appears as FS 98 / FS 99.
2Possible causes
- Fault on the power or control board
- Worn capacitors
- Damage from overvoltage — lightning or grid
3What to do
- Switch off AC and DC, wait 2–3 minutes and restart once.
- If the code returns, it cannot be fixed on site — it needs diagnosis in our lab.
Codes covered
This fault appears with the codes FS 98, FS 99. 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.