DIAGNOSIS: The 'burn' error triggers when the bottom temperature sensor detects food is sticking and burning before it reaches pressure. Yeah, this one's common with thicker sauces, tomatoes, or if you didn't deglaze after sautéing.
FIX: Cancel the program, let it cool, and open the lid. Add at least a half cup of liquid (water, broth) and use a wooden spoon to scrape the bottom of the pot thoroughly to release any stuck bits. Stir everything together. Restart your program. For future cooks, always ensure you have enough thin liquid (not just dairy or thick sauce) in the bottom layer.
IF THAT DIDN'T WORK: The ceramic nonstick coating might be degraded if you've used metal utensils. Inspect the bottom for scratches or dull patches. A compromised coating makes sticking more likely. You might need a new inner pot.
HEADS UP: Don't ignore this error and try to keep going. It shuts off heating to prevent scorching, and continuing will just make the burnt layer worse and potentially trip the thermal fuse.