Try calling the manufacturer
Had a similar problem last summer - ours was going off 3 times on the 2 days it was set to water. Got one of those letters about using too much water. We thought we had fixed it - didn't.
Ours is a Hunter system - phone # is 800-733-2823. My neighbors called while we were in Ohio for several months and Hunter talked them thru it. They stood in front of the control system on the phone. If you have a different system, try looking for a customer service # - maybe posted right on the control.
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