Check the salt at the water level to see if a solid mass has developed (called a “bridge”), or if fine “mushy” salt is lying at the bottom of the tank (called mushing). If a bridge, carefully break up the mass to allow it to drop into the water below. If mushing, remove the good pellets, scoop out the “mushed” salt, and reload the good pellets.
If the salt keeper was empty at the time of fresh salt addition, check the water level in the tank. If lower than normal, the float may be stuck in the internal side column. Remove the cover and check the mechanism to determine if it is working freely. If not, call the service department of the water softener manufacturer and arrange for a service call.