Customer called me and described a knocking sound waking her up concurrent with the sprinklers running at 4 AM. I thought maybe it was water hammer and went over top check this evening. Tried to run the ESP-M that IO installed in March manually and the red alarm light went on. Then there was something in the display about a delay.. then it said no AC... then MV err, station 1 err, 2 err, 3 err, 4 err, 5 err. Each time I tried a station manually it said err and then it pulsed like using a Chatterbox. Then I did the contractor default deal, and since I had never saved the program it went to a default of 10 min every day. So I reprogrammed it. Then tried a manual start and everything worked fine... Didn't have the manual in the box...I think the gardener took it, so I wondered if he messed with the program too. Anyway... what the hell could have happened?