I have the same Hunter controller and the same issue as the OP. The seasonal adjust setting is always on 10 percent regardless of how you initially set it. So, if you set the watering times for 20 minutes per zone and the seasonal adjust for 100 percent (per the instructions), the next day, the setting will have reset to 10 percent and now you are watering for 2 minutes per zone instead of 20 minutes. I think VT, the poster who said the outside sensor is defective, is correct. I decided to just leave the seasonal adjust at 10 percent and set the watering times manually. I could replace the outside sensor, but then the solar sync system will control the watering times, not me. Many people have replaced the outside sensor with a wireless rain sensor only, and I think that is the best way to go. In my opinon, the Hunter solar sync system is a worthless feature, and it cannot be permanently disabled without disabling the rain sensor as well.
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