There are 4 stations in the front yard only, and the system has worked for more than a year without any problems. Presently, the valves are not opening at each station, although everything looks good at the wall control unit. Firstly, the system is set on auto mode. When I manually turn on the system by pressing the far right button, the times flashing at each station look correct -- but apparently the valves are not opening at each ground station. The system test worked good, and all of the displays (custom mode, with actual days "Su", "Mo" etc, time of day, and station times checked good). The 500 mA fuse is good, I also removed the battery and plug for 2 minutes then placed them back in. There is good water pressure at each station, since I was able to turn each control valve (ground boxes) 1/4 turn left and the stations came on with strong pressure. Question is: what causes the valves to not open when the wall control system appears to be functioning correctly? (did a landscaper cut the major wire bundle leading to all of the ground boxes?).