The check light won't go out so that means the Propane cooling is not working. Dometic 2652 fridge troubleshooting revealed it was a control panel issue. I replaced the control panel and all is normal again.

Before assuming it is the control panel, check your wiring coming from your control panel for continuity. Is the Ignitor spark working? Do you have propane and is it on? Is the burner area full of junk and needs cleaned out for a flame?

I searched MANY YouTube videos, but didn't find one on replacing the control board for this problem. The AC from shore power kept the fridge working but the LP gas was not working.

I'm no technician, so this is what I did and I don't recommend you follow this video to repair your own unit if you aren't qualified to do so. It worked for me, hope it will help you out.

Checking for different issues, good video. This was a wiring problem:
   • Troubleshooting A Dometic RV Refriger...  

I did it, Garland Style of course.