1) Be sure you're using the correct amount of liquid/water for every cup of uncooked rice added to the inner pot. Accurate amounts and ratios can be found in your product manual for reference.
2) Rinse your rice thoroughly before cooking to reduce the amount of bran and starch on the grain. Excess starch may cause the water to bubble up and produce a sticky residue.
3) Adding a thin layer of nonstick cooking spray or oil to the rice/liquid prior to cooking may help to prevent bubbling.
If you misplaced your product manual, go to our Product Manuals page to find an online copy of the manual.