Question
I can not turn one section (#4) on with the manual switch.  It works with the timer and the semi auto key with the zone program switches on.  Thank you for your help.

Answer
Hey Carlo, if the valve works with the automatic feature, but not with the switch, then the valve is okay. Your problem is in the #4 slide switch, it is not making contact when you slide it to manual. This is probably due to age. It is not worth fixing. If you need to turn the valve on manually, then it is probably time for a new controller. Good luck and have a great day.