First let me say that until you get the unit working again PLEASE do what PoolDoc asked so you can chlorinate your pool manually so you do not have problems.

The mineral springs units were rebranded Goldline units (Hayward) and looked like this:

IF that is what yours looks like then the flow switches do go bad or get fouled with calcium. They really cannot be cleaned when this happens but should be replaced, IMHO.
Here is a short video that shows you how to do it properly.