The top cover on your unit provides shelter for the electronics and moving parts.
1. On the back of the unit, unhook the two clips that hold the cover onto the tank below (see photo). Flex/pull the cover out and away from the softener at these clips.
2. There are two similar clips holding the front of the cover on as well. Slide the cover towards you to release these clips, being careful not to disconnect any wires. It is normal for the plastic cover to produce some noise as it shifts and bends.