Water backs up into the dishwasher from the sink or garbage disposer.

Safety: Turn off power before disconnecting drain hoses.

• Clear sink drain: Ensure the sink and garbage disposer drain freely. Clear any clogs.
• Check disposer connection: Verify the dishwasher inlet on the disposer is clear and the knockout plug has been removed.
• Install high loop: Route the dishwasher drain hose up under the countertop before it connects to the sink or disposer to prevent backflow.
• Inspect air gap: If present, remove the air gap cap and clean out debris.