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When a dishwasher discharges its wastewater, it uses a pump to quickly move a lot of water. If anything in the drain line or the garbage disposal impedes the high volume of water, it will back up into the sink through the drain or the garbage disposal. Following regular dishwasher maintenance tips like clearing clogs, keeping them cleared, and occasionally running the disposal will eliminate the problem.

The cost to repair a dishwasher is $200 on average, with the typical price ranging from $160 to $300. However, if you need a more specialized repair, that total could reach $600. The main cost factor is the price of the replacement part, but the dishwasher’s make, model, and year can also impact the price. 

For a simple repair, such as a filter replacement, you can comfortably budget to spend between $50 to $100. But for something more complex like a repair on the dishwasher’s motor, you might see a bill totaling $400 to $600.

Yes, you can use vinegar to unclog a dishwasher. To do so, combine 4 tablespoons of white vinegar with 4 tablespoons of baking soda and pour the mixture down your dishwasher’s drain. Let it sit for 15 minutes, then pour a cup of hot water down the drain to flush everything out. Finally, run a rinse cycle on your dishwasher to see if the clog is gone.

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.