Heads
A cracked head, a clogged nozzle, or a head mowed off at the stem floods one spot and leaves the rest of the zone short. We run the station and watch where the water lands before we replace anything.
Valves and zones
A zone that will not turn on, or will not turn off, is usually the valve, the solenoid, or the wire to that station. A controller that still clicks through the other stations is not automatically a bad clock.
Leaks and pressure
A soggy patch that stays wet after the clock is off can be a lateral or a main. Low pressure on every station points somewhere else: a partly closed stop, a pressure regulator, or too many heads on one valve. Call 346-642-6161 and say which of those you can see.