|Kenmore C-120 Wall Unit|
Always start a search like this by Google-ing the unit model and what you need, i.e. "Kenmore C-120 Users Manual". Stay away from websites claiming to have all of the manuals in the world. They just want to sell you something.
I ended up here LINK. This is Kenmore's official website. They are trying to sell you the unit, but if you scroll down you can see the Owners Manual. I've linked it directly so you can view it. Unfortunately the manual does not address the fault code "FT" so we cannot use this information to get any further. I will try to get more info from the owner so we can try to further help.