I've had a similar problem lately...the Run Time changes by itself going well above the time I originally programmed. My water bill was very high and that's how I found out we had a problem. (Since we can only water at night while we are sleeping, one can never know if one is overwatering.) I checked out the instruction manual online and reset the Controller. And it still changed the Run Time by itself again. Our system is only 4 years old! I'll probably have to call the Warranty Dept. for further help.
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