Newbie - Aqua Rite Troubleshooting Question

Thanks to all for the great help so far. I just turned on my Turbo Cell T-Cell 15 and I'm running into some questions. The display reads "2400" and the "Check Salt" light is blinking red and the "Inspect Cell" is blinking yellow.

I have it set to Auto and 50%. The "Power" and "Generating" are both solid green.

Any ideas what the "Check Salt" light means? Do I need to add more salt?

I have a 22K IG pool.

I ended up adding some salt, slowly of course, and then after 24 hours these two lights went away. The only thing on now is the "Power" and "Generating" are both solid green. So, problem solved!