Whirlpool garbage disposal runs but food backs up into the opposite sink basin.

Safety first: Turn off the disposal and do not continue to run it against a blockage.

• Plunge the non-disposal side: Use a sink plunger on the non-disposal basin while blocking the disposal side with a stopper to clear minor clogs.
• Clean cross-over and trap: Remove the cross-over tube and P-trap under the sink, clear any debris, and rinse thoroughly.
• Check for grease buildup: Scrape and clean any grease from the pipes.
• If blockage persists: The clog may be further in the wall; use a drain snake or contact a plumber.