I had the same thing happen in my 2014 Thor Palazzo 33.2 (fresh water tank fills even with inlet water valve not set to do that action). After seeing a thread on this very subject in the Thor forums, I replaced the core of the Anderson Kantleak four-way water inlet valve. Apparently, Anderson Brass Company has a new, improved design that fixes this problem. Any coach manufactured before approximately March 2015 could benefit from the improved design, and Anderson Brass is very helpful and forthcoming regarding replacing the old design with a valve of the new design.
