It can be one of several issues, first the rain\solar sync sensor on the outside of the house, second, if its an older ProC with an external solar sync in the controller it may be that. The last one I had this problem with ended up changing out the entire controller. I think I paid $130 for new ProC controller four station, the rain, solar sensor cost $85 at Site One in Leesburg. I do this type of work all the time and would be happy to help. PM me.
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