Why is My Dishwasher Not Draining?

Seeing a pool of standing water at the bottom of the dishwasher after a long cycle can be a stressful sight for any homeowner. There’s nothing worse than opening the door expecting clean dishes and seeing a pool of murky water and food particles. Before you panic and assume the entire dishwasher is broken, take a deep breath.

These dishwasher drainage problems are incredibly common, and most of the time, you can fix the issue yourself pretty easily. This guide will walk you through the most common reasons a dishwasher won’t drain and show you exactly how to unclog it like a pro.

Before we dive into some fixes, let’s rule out the simple things. Sometimes the drainage system just needs a quick reset or a clean path to drain.

The garbage disposal is usually the number one reason for a clogged dishwasher. Your dishwasher and kitchen sink often share the same drain, meaning that if your garbage disposal is full of food debris, the water from the dishwasher has nowhere to go.

• The Fix: Run your disposal for 30 seconds with hot water to clear any blockages.
• The New Install Tip: If you just installed a new disposal and your dishwasher is not draining, the knockout plug might still be inside the disposal inlet. You will need to remove the drain hose and pop that plastic plug out for everything to drain correctly.

Sometimes a drain cycle gets interrupted. Try canceling the current cycle and selecting the drain option to see if the drain pump engages. If you hear a humming sound but no water flow, you might have a mechanical blockage or a failing pump motor.

If the disposal is clear and the dishwasher still won't drain, follow these steps to find the culprit.

Remove the bottom rack and use paper towels to soak up the remaining water. This allows you to see the bottom of your dishwasher clearly. Check for any fallen utensil items, glass shards, or large food debris that might be covering the drain grate.

Most modern units have a removable filter located near the spray arms. Over time, a buildup of grease and food particles can completely seal this filter. In Las Vegas, hard water deposits can calcify on the filter. Soak the filter in white vinegar for 10 minutes before scrubbing to dissolve mineral buildup.

• The Fix: Twist the dishwasher filter to remove it. Rinse it under hot water in the sink. Use a soft brush or an old toothbrush to gently scrub away stubborn gunk.

Some dishwasher units have a small cylinder on the countertop next to the sink faucet; this is the air gap. It prevents dirty water from siphoning back into the machine. Not all dishwashers use an air gap; some use a high loop in the drain hose instead. If you don't see a cylinder near your faucet, your dishwasher likely uses the high-loop method, covered in Step 4.

• The Fix: Pop off the decorative cover and check for clogs. You can often use a small brush to clear out any blockages hiding inside.

Pull the dishwasher out slightly and look at the dishwasher drain hose. If the hose has kinks, the water flow will be restricted or stopped entirely. Ensure the drain hose has a high loop before it connects to the sink drain to prevent backflow.

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If you suspect a partial clog further down the line, you can try a natural DIY solution before calling a plumber.

Step 1: Pour 1/2 cup of baking soda into the standing water.

Step 2: Pour a 1/2 cup of vinegar after the baking soda to create the reaction.

Step 3: Let it sit for 15 to 20 minutes.

Step 4: Run hot water in your sink, then start a short wash cycle. The chemical reaction can help break up organic buildup.

While many common issues are easy to fix, some involve electrical components or mechanical failures that require a licensed plumber to repair.

• Failing Drain Pump: If the pump is making a loud growling or screeching noise, it likely needs to be replaced.
• Broken Drain Valve: On older models, a failing drain valve can keep water trapped inside.
• Electrical Issues: If the dishwasher doesn't even attempt a drain cycle, there could be a problem with the control board.

If your troubleshooting and DIY fixes have reached a dead end, our team of licensed plumbers is here to quickly diagnose the issue and repair the dishwasher so you can get back to enjoying clean plates, stress-free. Whether it is a quick repair job or an installation of a new unit, our team provides upfront pricing and 100% satisfaction guarantee on all of our work.

Still seeing a pool of water in your dishwasher? Call Dr. Cool at (702) 608-6939 or schedule your professional dishwasher repair online today.