Culligan Water Softener question

[teacherguy]

New home owner here...I've got a Culligan Mark 100 Soft-Minder Dual Tank Water Softener system in the house, but I can't figure out how to program it. Yes, I downloaded the available user's guide online and I follow the directions for programming the display on the softener, but when I'm done doing all the programming it reads " C5 " and doesn't do anything. I even tried pressing "REGEN" twice (as in the directions) to initiate an immediate renegration - still nothing. Any advice, or am should I just call Culligan?

Thanks in advance for your help!

-Teacherguy

[HayZee518]

I read in a different forum that C5 is actually CS which means call service. a guy says that a canister packing is not sealed properly. also the valves that culligan has are not diy servicable