You completely removed tray 1 out of the printer and set it on the table or beside you and looked behind the tray for paper?
Make sure your fuser is installed correctly.
You might need service.
Here is the article related to that fault code. You may need to replace the paper tray feed rollers if everything else hasn't resolved the issue.
I cleaned the printer with an alcoholic wipe and checked for paper jams everywhere. I don't see anything. can you please help to fix this?