Can you post the E-Nr number of the appliance please?
It may be faintly etched across the top of the inner door.
E15 indicates the anti flood device in the base has been activated.
Empty the machine.
Take it out.
Disconnect the hoses if necessary.
Tilt the machine rearward until it's on it's back.
See if water from the base runs out.
If it does, drain the base.
Stand the machine up again.
Reconnect it and try the machine again.
If it's a leak, it will fault very quickly again.
If not, it's just been a spillage.
Hope this helps
Let me know how it goes or if you need more help