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A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters. 

Costs depend on labor rates, replacement part prices, brand, and whether emergency service is required.

To clean an old dishwasher without a filter, start by removing the bottom rack to access the drain area. Use a damp cloth or sponge to wipe down the interior, paying special attention to the corners and crevices where food particles and debris can build up. Pour a cup of white vinegar into a dishwasher-safe bowl and place it on the top rack, then run a hot water cycle to help break down grease and grime. After the cycle, sprinkle a cup of baking soda across the bottom of the dishwasher and run a short hot water cycle to deodorize and further clean the interior. 

Some common signs you have a dirty dishwasher filter are:

• Food sticking to your dishes even after a thorough wash cycle

• Odor coming from your dishwasher

• Stains left on dishes and utensils

• Water pooling in your dishwasher

• Food stuck to parts of the dishwasher, like the racks, walls, or sprayer arm