- Error code
- K1-open
- Category
- Grid relay
- Manufacturer
- SMA
- Models
- Sunny Boy (SB)
1What the error means
Grid relay K1 did not open when it should have — its contacts are stuck. This is a serious safety issue, because the inverter cannot disconnect from the grid.
2Possible causes
- Stuck relay contacts, usually after an overvoltage or overcurrent
3What to do
- Do not ignore this fault: disconnect the inverter at the AC switch.
- The relay needs to be replaced in our lab.
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.