It could be many reasons. Here's two things you can try. 1. This will take 3 people, one on a ladder and one at the irrigation box. There is a "button" on top of the sensor, press it down. At that time the irrigation screen will display off, or sensor off. If you don't see this, your connect from the sensor to panel may be broken. You have to fix that. If you do see the message, pop the cover off the felt, holder. Clean the edges of each filter, to remove dirt/spider webs. Check after next rain fall. If you need new pads (mine had 8) Order on Ebay, South East Irrigation Supply. Good luck.
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