Thanks for your question.
It is very possible that it could be a couple of things. The first thing I would check is to see if the timing motor is working. Take the cover off of the control head and look at the back. There will be a round motor (generally silver) that has a clear panel to look in. If it is running correctly it should be moving.
The other thing this could be is that the softener needs to be backwashed manually. If this is the case please refer to your owners manual.
Hope this helps.