In the past two weeks we have installed 11 15558 timers. I have received calls saying the lights did not come on last night. On the first call I thought the GFI or breaker probably tripped. When I checked it out (there are two transformers at this location) it was like the time had been set but the on/off was never programmed. This was my second visit to this location with the same trouble. Since then 8 other timers have done the exact same thing. I am puzzled. Was this just a bad batch of timer? I have always used this particular timer with few troubles. Has anyone seen anything like this before?