Using the irritrol remote control system, my lawn can receive water at a scheduled time of the week. I've been using this for the past two years, but a week ago, the system stopped working. Valves 1, 2, 5 and 6 do not have water running through it, but 3 and 4 are working perfectly. I doubt it is the remote control's problem, so my question is: what is causing the lack of water for those particular valves? This happened suddenly, I'm certain no changes occurred from Monday (the first day of the week my lawn gets watered) to Thursday (the second day).
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