The F5 E3 fault code signals a problem in the lid lock.

Do not use force to open the lid, or you will ruin the lock completely. Take away whatever objects there are on the lid and make sure there are no obstructions.

To exit the cycle, press Power. To release the lid, press it again.

If this does not work, reset the washer: switch it off for a couple of minutes. Then switch it back on and check for the error.