- Error code
- 800–999
- Category
- Internal fault
- Manufacturer
- KOSTAL
- Models
- Piko / Plenticore
1What the error means
Internal fault. The inverter detected a disturbance in one of its internal circuits — power, control, measurement or communication — and stopped. The whole 800–999 group belongs to the internal faults and cannot be fixed on site.
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 800–999. 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.