It's also possible that the installer didn't even hook up the sensor. That's what happened to ours. If it's a fairly new house, that could be the problem. The builders leave them off so the system will run and give the landscape water without relying on the sensor until the house is sold.
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Greg
A pessimist is an optimist with experience.
"In my many years I have come to a conclusion that one useless man is a shame, two is a law firm and three or more is a congress." - John Adams
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