Sorry for the delay in getting to your question.
do you still require help with this?
F05 indicates the pressure switch is stuck on full.
This happens when the appliance hasn't drained the water out.
You need to check the drain hose where it connects to the house drains.
See if there is a blockage there.
Drain the water out manually again. (if it's stuck full of water).
Ensure the drain pump is actually running.
Check that there's no small item jamming the pump.
Check it out, let me know what you find.
Hope this helps
Let me know how it goes
Unplug the appliance.
Take the top of the appliance off.
Look for a thin tube running up the side of the drum or casing.
It comes from the bottom area of the machine up to, and connects to, the pressure switch.
It can be oval or circular in shape.