My HD-12 used to work correctly with a master valve (zone 1) and 4 zones (2-5). Recently, zone 5 activates at the same time as 4 and will not activate when zone 5 is turned on by itself. I tried moving the wire from zone 5 to the zone 6 position, but it did not change the behavior. I tried unplugging the unit and plugging it back in.
Any ideas what might be causing the problem? The water pressure is too low when both zone 4 and 5 run together, so I really need to get these separated.
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