I bought the doorbell kit from x10 and I'm having trouble getting the big red button to work. The kit came with the TM751, KR15A, and the SC546A. I have connected all of these but cannot get it to work. When I use the KR22A that I bought as well to signal the chime it works fine. For some reason, the big red bell set to the same house and unit code will not work. Any ideas?