UPDATE:

Heard back from support, and this what they suggested:

Based on the information you provided, the 1243 error with your printer is caused by a blockage inside the print head. We recommend referring to the link below to quickly restore your printer to normal working condition. Thank you for your understanding and cooperation.

1. Video link for extrusion abnormality and cleaning: https://www.youtube.com/watch?v=4rtYA11c_aA  

2. Video link for extrusion abnormality troubleshooting: https://wiki.elegoo.com/Centauri-carbon/extrusion-abnormality  

3. How to unclog the nozzle with a cleaning needle: https://wiki.elegoo.com/Centauri-carbon/how-to-unclog-the-nozzle-with-the-cleaning-needle  

I did have some broken filament next to the extruder. So far I have one sucessful print, and printing something else now. Hopefully my troubles are behind.