I had problems with my wall unit several years ago with eratic operation. Sometimes it worked, sometimes not. I bought a replacement and it solved the problem. As I recall, the only wires to connect to the wall are obviously directly connected to the control unit on the ceiling. The ceiling unit is the brain. The wall unit has a control board and serves several purposes. I believe all purposes are to communicate with the ceiling unit. So failure to work would mean that either the wires are defective (Short), the ceiling unit is defective, or the wall unit is defective. Wire problem check to insure good connections. Ceiling unit working ok in all other functions, go to source of problem ie the wall unit. I should note that someone had a spare wall unit that they gave to me and I tried it with no success. New one worked. Was about $12 on EBAY. No reprogramming was required.
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