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Yes, a dishwasher needs an air gap to prevent backflow. Additionally, in many locations, air gaps or another measure to prevent backflow are required for building code compliance. There are alternatives to an air gap, like a Studor vent or a loop and trap design, but an air gap is the simplest and most popular solution.  

To get rid of standing water in your dishwasher, first try activating the drain mechanism by pressing and holding the cancel button for at least three seconds. If that doesn’t work, you’ll need to do some troubleshooting to drain the standing water from the dishwasher. This will involve shutting off the power, then scooping out the water, cleaning the drain filter, and clearing the air gap. You’ll also want to run the garbage disposal and check the drain hose for clogs.

To create a siphon break and remove any chance of dirty sink water or water that backs up into the sink from getting into your dishwasher, your dishwasher drain hose needs to have a high loop or an air gap device as part of its installation. All building codes require at least a high loop. In many places, it’s necessary to install an air gap device to meet the code.

Regular use helps keep interior dishwasher parts functioning properly and the interior clean. Try to run your machine at least once every two weeks as part of your dishwasher cleaning schedule.

Every six months, running two cups of white vinegar through your dishwasher (place the vinegar where you put detergent) will help deep clean the unit to boost performance.