Fixing a Dishwasher that Doesn't Drain Properly: Common Causes and Solutions

If you notice water sitting on top of your dishes after a dishwasher cycle, there may be several causes. This article will guide you through identifying and resolving these issues, ensuring your dishwasher operates effectively.

Common Causes and Solutions

The process of identifying and fixing a dishwasher that isn't draining properly usually involves a systematic approach. Here are some of the common issues and potential solutions:

Clogged Filter

Causes: Over time, food debris and grease can accumulate and clog your dishwasher's filter, preventing proper drainage.

Solution: Regularly clean the filter according to the manufacturer's instructions. Rinse it under hot water to remove any buildup. This simple step can often solve the problem without the need for professional assistance.

Blocked Drain Hose

Causes: The drain hose can become kinked, clogged, or blocked, preventing water from draining out as it should.

Solution: Inspect the drain hose for kinks or blockages. If it is clogged, you can detach it and flush it out with water to ensure it is clear. This is a straightforward process that can be done by most homeowners.

Garbage Disposal Issue

Causes: If your dishwasher is connected to a garbage disposal, a clog in the disposal can interfere with drainage.

Solution: Check the garbage disposal for any clogs. Ensure that the knockout plug has been removed during the installation process if it’s a new dishwasher. Clearing a clog or verifying the correct installation can resolve the issue.

Faulty Drain Pump

Causes: A drain pump that is malfunctioning or blocked can prevent effective drainage.

Solution: Listen for the sound of the pump during the drain cycle. If the pump is silent or making unusual noises, it may need repair or replacement. Consulting the user manual or a repair guide may provide additional insights.

Air Gap Issue

Causes: The air gap, a device mounted on the sink, can become clogged if not properly maintained.

Solution: Check for blockages in the air gap and clean it out to ensure proper drainage. This is a simple task that requires minimal effort.

Incorrect Installation

Causes: If the dishwasher was recently installed, ensure that it is installed correctly with no bends or kinks in the drain hose.

Solution: Make sure the drain hose is installed at the correct height with no folds or kinks. Proper installation can prevent drainage issues and is a crucial step in ensuring your dishwasher works as intended.

Water Level Switch Malfunction

Causes: A faulty water level switch can cause the dishwasher to think it's full of water, even when it isn't.

Solution: Test the water level switch to determine if it is malfunctioning. If it is, consult the manual for guidance on replacing it. This can be a DIY solution, provided you have the correct replacement part.

Electrical or Control Board Issues

Causes: Failed electronics can prevent the drain cycle from completing.

Solution: Check for error codes on the control panel and refer to the user manual for troubleshooting steps. Although this might require more advanced knowledge, checking the control panel for error codes can often provide clues about the issue.

General Steps to Troubleshoot

Begin by running a short cycle to see if the issue persists. This can help determine if the problem is isolated or ongoing.

Check for leaks around the dishwasher. Any leaks may indicate a problem with the hose connection or a faulty seal.

Inspect the spray arms and interior of the dishwasher for any food particles or debris. Clearing these can help ensure the dishwasher operates more efficiently.

If you have reviewed these potential issues and the problem still exists, it may be best to consult a professional technician for further diagnosis and repair.

By following these steps, you can address common problems that prevent your dishwasher from draining properly and ensure your dishes come out clean and dry after each cycle. Regular maintenance and a basic understanding of these common issues can significantly extend the life and efficiency of your dishwasher.