Need some expert advice... New Orbit timer turns on new valves in the front yard fine. Old back yard valves won't turn on and valve gives a "fault program" message. No breaks in the wire. Connections are clean. I tested the valves with a 9 volt battery...one sparks and won't turn on, but the others will run with 9 volt battery. Is it possible a 9 volt battery will run a solenoid but not a timer due to some problem with the solenoid that the timer recognizes? Thanks!