- Error code
- E021
- Category
- Grid relay
- Manufacturer
- ABB / FIMER
1What the error means
Fault in the grid relay of the inverter. The inverter does not connect to the grid if the relay fails the check.
On the display or in the monitoring software it appears as Int. Error.
2Possible causes
- Stuck or burnt relay contacts
- Fault in the relay drive circuit
- Wear after many switching cycles
3What to do
- One restart with AC and DC switched off.
- If it returns, the relays need 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.