How to Clean a Dishwasher Drain Pump: Remove Debris

Why the drain pump gets clogged

The drain pump is the small impeller-driven pump that pushes wastewater from the sump to the house drain. Food particles, broken glass, and other small objects can get past the filter if the filter is not seated correctly or if dishes are loaded with heavy debris. Over time, this material accumulates in the pump chamber and can block the impeller, causing slow draining, gurgling noises, or a dishwasher that stops mid-cycle.

To minimize debris entering the pump, scrape dishes before loading instead of rinsing. ENERGY STAR recommends scraping rather than rinsing, because rinsing increases water and energy use while still allowing food to wash into the sump. A clean filter also acts as the first line of defense; inspect it regularly as described in our dishwasher filter cleaning guide.

How to access the drain pump

Accessing the drain pump requires removing the lower rack, lower spray arm, and the filter assembly. The exact steps vary by model, but the pump is almost always located at the bottom center of the tub, directly beneath the filter screen. Work slowly and keep track of fasteners.

Follow these general steps:

• Disconnect power: unplug the dishwasher or turn off the circuit breaker.
• Remove the lower dish rack to expose the spray arm and filter.
• Unscrew or unclip the lower spray arm and lift it out.
• Take out the filter assembly (typically a cylindrical coarse filter and a fine mesh filter).
• Look for the drain pump inlet, usually a round opening at the bottom of the sump.
• If there is a plastic cover or screen over the pump, remove it with a screwdriver or pliers.

Clearing food particles and debris

Once the pump is exposed, use a small brush, an old toothbrush, or a damp cloth to wipe away food particles from the pump housing and the impeller. A wet/dry vacuum can also be helpful for sucking out loose debris, but avoid forcing anything deeper into the pump. Check the inlet screen if present, as it often catches the largest particles.

For stubborn buildup, use a spray bottle of warm water to dislodge residue. Do not use wire brushes or sharp metal tools that could scratch the pump housing. If your dishwasher has a hard food disposer or self-cleaning filter, cleaning the pump is still necessary occasionally to remove particles that bypass the chopping mechanism. Refer to our drain pump vs. gravity drain explainer for more on how these systems differ.

Dealing with broken glass

Broken glass is one of the most damaging items that can enter the drain pump. Sharp shards can crack the impeller or score the pump housing, leading to leaks or premature failure. Always wear heavy rubber gloves when handling glass in the sump area.

Use a damp paper towel or a slice of bread to pick up tiny fragments, and inspect the pump chamber with a flashlight to make sure no pieces are hidden. If you find glass in the pump, also check the filter and the sump walls for fragments. A dishwasher with a stainless steel tub is easier to inspect because the surface is smooth, as explained in our stainless steel vs. plastic interior article.

Checking the impeller for damage

The impeller is a small plastic or metal fan-shaped wheel that spins to move water out of the dishwasher. After clearing debris, turn the impeller by hand. It should rotate freely without resistence. Look for cracks, chips, or missing vanes. If you see any damage, the impeller or the entire pump assembly may need replacement.

A damaged impeller will not push water effectively, causing poor drainage even after cleaning. In that case, you may need to replace the pump. Our drain pump replacement guide provides steps, and our how to check the drain pump impeller offers a deeper diagnostic process.

Reassembly and test

After cleaning and inspecting the pump, reinstall the filter assembly, spray arm, and lower rack. Make sure every component clicks or tightens into place. Reconnect power and run a short rinse cycle (or a normal cycle) on an empty load. Watch and listen for smooth draining and no leaks.

If the dishwasher still drains slowly or makes noise, the issue may be a blocked drain hose, a faulty check valve, or a broken pump motor. Check our dishwasher drain pump blocked troubleshooting guide and dishwasher not draining troubleshooting for next steps. Regular cleaning of the pump and filter, combined with proper scraping of dishes, will keep your dishwasher reliable for years. When you are shopping for a new model, consider the drain pump design and filter type; our buying guides can help you compare current models.

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Questions

How often should I clean the dishwasher drain pump?

Clean the drain pump at least once a year, or more often if you notice slow draining, gurgling sounds, or a lingering odor. If you frequently wash dishes with heavy food residue or have broken a glass in the dishwasher, inspect the pump sooner.

Can I clean the drain pump without removing the filter?

No. The filter covers the sump and pump inlet. You must remove the filter assembly to access the pump chamber and impeller. Consult your owner's manual for the proper removal procedure for your model.

Is it safe to run the dishwasher after cleaning the pump?

Yes, as long as everything is reassembled correctly and the pump impeller is not damaged. Run a short rinse cycle on an empty load and check for leaks or unusual noises before using the dishwasher normally.

What should I do if the impeller is cracked or broken?

If the impeller shows any cracks, chips, or missing vanes, replace the pump assembly or the impeller kit, depending on your model. Running the dishwasher with a damaged impeller can lead to poor drainage and further damage to the pump motor. See our drain pump replacement guide for steps.

Can broken glass damage the drain pump permanently?

Yes. Glass shards can crack the impeller, score the pump housing, and clog the drain line. Sometimes the damage is permanent and the pump must be replaced. Always wear gloves and carefully remove every fragment when cleaning.