Why Your Dishwasher Won't Drain: 2025 Guide

Troubleshooting Dishwasher Draining Problems

If your dishwasher isn't draining, start with the simplest checks. Blockages from food particles, debris, or other obstructions in the drain pump filter, garbage disposal, air gap, or drain hose are common reasons for this issue. The position of the drain hose might also cause a problem with draining. Addressing these problems can often get your dishwasher draining properly again without needing a major repair.

Check for Food Particles and Debris

Food particles and debris can easily cause dishwasher drain problems. These can build up at the bottom of the dishwasher tub or clog the drain pump filter, preventing water from draining away.

• Inspect the Bottom of the Tub: Open the dishwasher door and look for any visible food debris or particles around the sump area. Remove any buildup with a paper towel or cloth.

• Clean the Drain Pump Filter: Locate the drain pump filter, usually found at the bottom of the tub. You can check your owner's manual for its location. Remove the filter and rinse it under running water to clear out any food particles or debris. Make sure to securely reinstall the filter before running another cycle.

Check the Garbage Disposal

A clogged garbage disposal is another common reason a dishwasher won't drain. Dishwashers are often connected to the garbage disposal, and if the disposal is blocked, water won't drain properly from the dishwasher.

• Run the Garbage Disposal: Turn on the garbage disposal to clear any waste that may be blocking the drain path. Run water into the disposal for a few seconds after it stops to ensure the drain is clear.

• Inspect for a Knock-Out Plug: If a garbage disposal was recently installed, make sure the knock-out plug in the drain pipe connection was removed. Follow the manufacturer’s instructions to remove this plug if it is still in place.

Check the Sink Air Gap

An air gap, installed on some kitchen sinks, prevents drain water from backing up into the dishwasher. If the air gap is clogged with debris, it can cause draining problems.

• Inspect and Clean the Air Gap: Remove the air gap cover and check for any clogs. Clean out any debris using a small brush or rinse it with water. Securely reinstall the air gap cover.

Check the Drain Hose

The dishwasher drain hose must be installed correctly to ensure proper draining. If the hose is kinked or if there isn't a high loop, it can cause water to back up into the dishwasher.

• Inspect the Drain Hose for Kinks or Blockages: Check the drain hose from the dishwasher to the sink or garbage disposal for any kinks or visible blockages. Straighten any kinks you find.

• Verify the Drain Hose Loop: Ensure the drain hose has a loop that is higher than the drain connection point. This high loop prevents water from siphoning back into the dishwasher. Adjust the hose if necessary to create the proper loop.

By following these steps, you can often resolve draining problems without needing professional help. If these checks don’t solve the issue, consider more advanced troubleshooting or contact a professional technician.

Advanced Troubleshooting for Dishwasher Draining Problems

If the simple checks haven’t resolved the issue and your dishwasher still won’t drain, it may be time for more advanced troubleshooting. This could involve checking for deeper clogs, a malfunctioning drain pump, or even electrical issues. Here are some steps to consider:

• Check the Dishwasher Drain Hose for Clogs: If the hose was previously inspected for kinks, it’s time to look deeper. Disconnect the drain hose and inspect it for clogs or buildup that might not be visible from the outside. Clear any obstructions before reconnecting it securely.

• Inspect the Drain Pump: The drain pump pushes water out of the dishwasher. If the pump is faulty or obstructed, it won’t function properly. Access the drain pump and look for visible obstructions or signs of damage. If the pump is damaged, it may need to be replaced.

• Examine Electrical Components: Sometimes, a control board or wiring issue can prevent the dishwasher from draining. Check for any loose wires or burnt connections that might indicate an electrical problem. If you are not comfortable checking these components yourself, it’s best to call a professional technician.

For a detailed guide on how to perform these simple and more advanced troubleshooting steps, watch the video below:

Check for Error Codes

Dishwashers with electronic controls often display error codes when the circuit board detects a component failure inside the dishwasher. A digital code or a pattern of blinking lights will appear on the control panel to signal an error code. The code can help you determine what’s preventing the dishwasher from draining.

• Identify Error Codes on the Control Panel: If you see an error code on the control panel, consult the technical information about the code on our Dishwasher Error Code Charts or refer to the owner’s manual for your model to find out what the error code means.

• Follow the Troubleshooting Steps: Use the troubleshooting tips in the owner’s manual or the Dishwasher Error Code Chart to find and fix the cause of the drain problem.

If these steps don’t solve the problem, it may be time to schedule dishwasher service by a technician. Professional assistance can help identify and fix issues like a faulty drain pump or a control problem that prevents your dishwasher from draining.

Preventing Drain Problems in Your Dishwasher

Regular maintenance is key to preventing drain problems in your dishwasher. By keeping components clean and in good working order, you can avoid many common issues that cause a dishwasher not to drain. Here are several steps you can take to ensure your dishwasher stays in top condition.

Schedule Annual Professional Maintenance

Annual professional maintenance can help identify and fix potential issues before they become major problems. Sears Home Services offers comprehensive checks and maintenance for dishwashers, which include several important tasks:

• Inspect the Drain Pump: A technician will check the drain pump for proper operation and advise you of any problems. A functioning drain pump is crucial for ensuring water drains effectively from your dishwasher.

• Clean Removable Filters: Over time, food particles and debris can clog the filters, hindering water flow through the drain pump. Cleaning these filters regularly can prevent blockages and keep the dishwasher draining properly.

• Test the Electronic Control Board or Timer: The electronic control board or timer controls many of the dishwasher’s functions, including the drain pump. Technicians will test these components to ensure they activate the drain pump correctly, preventing any drainage issues.

By having these preventative maintenance steps performed annually, you can keep your dishwasher in good working order.

Maintain Your Dishwasher at Home

In addition to professional maintenance, there are several things you can do at home to prevent drain problems and keep your dishwasher running smoothly:

• Regularly Clean the Dishwasher Interior: Wipe down the inside of the dishwasher, including the door and seals, to remove any food particles or debris that could accumulate and lead to blockages.

• Run Hot Water Before Starting a Cycle: Running hot water in the sink before starting your dishwasher can help clear any buildup in the pipes, ensuring water drains more effectively.

• Avoid Overloading: Overloading the dishwasher can cause items to block the spray arms and prevent proper cleaning and draining. Make sure there’s enough space for water to circulate freely.

• Use the Right Detergent: Using too much or the wrong type of detergent can cause soap buildup, which might clog filters and drain hoses. Always follow the manufacturer’s recommendations for detergent use.

Comprehensive Appliance Maintenance

To keep all your home appliances in top shape, consider scheduling the Kitchen & Laundry Appliance Cleaning and Maintenance Bundle. A technician will visit your home to check, clean, and maintain all of your appliances in one convenient visit. This service helps extend the life of your appliances and ensures they operate efficiently.

Regular maintenance, both professional and at home, can save you time and money by preventing problems before they start. Trust Sears Home Services to help keep your dishwasher and other home appliances in top condition, allowing you to enjoy a smoothly running home with less worry.