- Error code
- 251–278
- Category
- Grid fault
- Manufacturer
- KOSTAL
- Models
- Piko / Plenticore
1What the error means
Grid problem. The inverter disconnected because the grid went outside the limits it monitors continuously. Codes 251 to 278 concern the same family of faults — the number shows which parameter and on which phase.
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.
Codes covered
This fault appears with the codes 251–278. 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.