Error code E93 on your AEG washing machine indicates a problem with the configuration of the machine. This can happen due to a power outage or a malfunction in the machine's electronic control board.
Here are the steps to fix it:
1. Turn off your machine and unplug it from the power source.
2. Wait for about 10-15 minutes. This gives the machine time to reset.
3. Reconnect the machine to the power source and turn it on.
4. If the error code persists, you might need to reset the electronic control board. For this, refer to the user manual for specific instructions on your model or contact AEG customer service.
5. If after all these steps the error code still appears, it's best to contact a professional technician for further assistance, as the problem might require specialized skills to fix.