Report "Have orbit timer mod 57974 , 4 station with an a and b zone control. three of five units work fine. the other two wont activate the solenoids. i tested the solenoids and checked the fuses on the boxes as well as the outlets providing power to the units, and the back up AA batteries. the units both program and say they are working when activated in manual mode, yet they do not activate the solenoid ???"