I KNOW!! I have been doing it for MONTHS now. (One of my cats has chronic loose stool and won't use the box). So I know the frustration.Cleaning up messy poo from the carpet every day is getting really, really old.
In your case though, adding an extra box or two at a more convinient location, should help. If the kitty is sleeping on the first floor and has the urge to go poop, the third floor can seem like an AWFULLY long ways away.
The other problem (like in my cat's case) is that diarrhea makes their tummies hurt and they associate the hurt with the litter box, so they chose another spot. So finding the cause and correcting it is your primary duty. (but can be difficult, as diarrhea is the symptom of MANY things).
Good luck.
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