Five in-ground controllers (zones) handle my sprinkler system sprinklers. These controllers are in 5 different areas on my property. I noticed today that when zone one comes on that zone two comes on at the same time which never was the case in the past. As a consequence, the pressure is inadequate. Zone two sprinkler heads also come on with zones 3 and 4.

Is this a selinoid problem, a timer problem or??

Do you have 5 separate switches, or a knob that should select one at a time? I need to think about this some more.

Hi,
It would be very helpful to know the manufacturer's name of your sprinkler system. Some use pressure valves, opening when there is enough pressure buildup, to go on and open Zone 2. Initially, it sounds like a bad valve(s).
Please post back.
Thank you.