My programmer has developed a mind of its own! I've lived here for 5+ years now & a couple of months ago the sprinkler started coming on at 3pm instead of 3 am. I checked it & was programmed for 3am. Again, it came on at 3pm instead of 3am. This time I checked the clock & noted that it was set for pm instead of am. I had never touched it so not sure how this happened. Then several weeks ago it started coming on at unpredictable times so now I have to turn the system on & off, I can't leave it on run. Someone mentioned in another thread to take the battery out & re-program but I don't know where the battery is & I can't open that smaller door under the main door. Even my brother tried. Is there a trick to getting it opened?