What does F-05 mean - Hotpoint Ultima WF865 Front Load Washer

Hi from retired Englishman in SW France,

Sorry but I do not know your particular machine BUT I would suggest as a first step that you clean the drain motor lint tray/filter. So many 'faults' are caused by blocked filters. The motor is unable to drain all of the water in the allotted time.
If you are unsure where the filter is, it is often behind the front lower (kick) panel (or in some machines at the rear in an awkward position!) and held in by a round cover/knob.

REMOVE POWER AND ENSURE YOU HAVE A WATER RECEPTACLE/RAGS TO SOAK UP THE WATER WHICH IS BOUND TO POUR OUT!

It's surprising what people have found in theirs! It is always worthwhile checking it on a regular basis.
Now- whilst the filter is removed it is normally possible to see the drain motor and ensure it is not jammed by a foreign object such as a needle or a toothpick. It should be able to be turned by hand/finger- the power IS OFF!
At this point it is also possible to test if the motor works. No clothes or water in the machine, select a spin cycle and put the power back on. You should be able to see the motor turning at some point, possibly straight away. If it doesn't work then the motor is malfunctioning!

Hope the filter is the problem and good luck!
John C