Thanks everyone.
I am north of 466 and have only one water supply.
There is no leak, as confirmed by zero flow when a water company tech checked the meter. Unfortunately, he was not completely clear about the possibility of sprinklers running when switched to OFF, but he did not rule it out.
It may have been the timer got screwed up from a power failure in my area, but the unit's 9 volt battery is still good.
I have reprogrammed it again. We shall see.
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