Rain Bird ESP RZX 4-section watering system. It uses 3 sections. I have been using the system for 6 years. It has worked without any problems. I mainly use the manual and when I leave, I turn on the programming. The last time I did this, I find that after setting the section number, watering time and start time, it is not possible to go to program days. Pressing NEXT has no effect. Resetting, turning off the power etc. changes nothing. Manual works without problems. The day indicator on the screen works normally. Does this mean that the controller needs to be replaced? I would be grateful for recommendations. Regards. Marek