Dishwasher Won't Empty (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

If your dishwasher won't empty, first check the drain hose for clogs and the filter for debris. If the pump is running but not draining, it may need cleaning or replacement.

Confirm the symptom

Water remains in the bottom of the dishwasher after cycles end
Dishes are wet but not clean
Dishwasher makes gurgling or humming noises during drain phase
Drain hose is kinked or clogged

Tools and prep

Screwdriver (flathead and Phillips)
Plunger (cup or sink type)
Bucket or container for water
Flashlight
Rubber gloves
Clean cloth or paper towels
Turn off power at circuit breaker for safety
Shut off water supply to dishwasher

Step-by-step troubleshooting

Check for Standing Water
Do: Open the dishwasher door and look for water at the bottom.
Observe: Water pooled in the bottom indicates a drainage issue.
Means: Drainage system is blocked or not functioning.
Next: Check the drain hose and filter.
Inspect the Drain Hose
Do: Locate the drain hose under the sink and check for kinks, clogs, or disconnections.
Observe: Hose is kinked or clogged with debris.
Means: Restricted water flow prevents proper drainage.
Next: Clear the clog or straighten the hose.
Clean the Dishwasher Filter
Do: Remove the bottom filter and clean it with warm water and a brush.
Observe: Filter is clogged with food particles or debris.
Means: Clogged filter blocks water from draining.
Next: Reinstall the clean filter and test the dishwasher.
Check the Air Gap (if applicable)
Do: Inspect the air gap on the countertop for blockage.
Observe: Air gap is clogged with debris.
Means: Blocked air gap prevents water from draining.
Next: Clean the air gap and test the dishwasher.
Test the Drain Pump
Do: Listen for the drain pump running during the drain cycle.
Observe: Pump is not running or is making unusual noises.
Means: Pump may be faulty or clogged.
Next: Check for clogs in the pump or replace it if necessary.
Inspect the Pump Impeller
Do: Remove the pump cover and check the impeller for debris or damage.
Observe: Impeller is clogged or damaged.
Means: Impeller is not moving water effectively.
Next: Clean the impeller or replace the pump.
Check the Drain Valve
Do: Inspect the drain valve for blockage or damage.
Observe: Valve is clogged or not opening properly.
Means: Valve is preventing water from draining.
Next: Clean the valve or replace it if damaged.
Test the Dishwasher
Do: Run a short cycle to see if water drains properly.
Observe: Water drains completely and dishes are clean.
Means: Issue is resolved.
Next: Monitor for recurring issues.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Drain Hose Food particles or debris block water flow.	Common	Easy	None
Clogged Filter Food debris accumulates in the filter.	Common	Easy	None
Clogged Air Gap Debris blocks the air gap passage.	Sometimes	Easy	None
Faulty Drain Pump Pump motor or impeller fails.	Sometimes	Medium	Drain Pump
Clogged Pump Impeller Food particles or debris block the impeller.	Sometimes	Medium	Drain Pump
Clogged Drain Valve Debris prevents the valve from opening.	Sometimes	Medium	Drain Valve
Kinked Drain Hose Hose is bent or compressed.	Rare	Easy	None
Faulty Water Inlet Valve Valve prevents proper drainage.	Rare	Hard	Water Inlet Valve

Parts matching

Common parts needed for a dishwasher that won't empty:

Drain Pump
Drain Valve
Filter (replaceable)
Air Gap Assembly

Purchase parts specific to your dishwasher model for compatibility.

When to call a professional

Water continues to pool after clearing clogs
Drain pump is damaged and needs replacement
You're unsure about electrical components or wiring
Dishwasher still doesn't drain after following all steps
Unusual noises persist after cleaning components
Dishwasher is under warranty and you don't want to risk voiding it

FAQ

How often should I clean the dishwasher filter?

Clean the filter every 1–2 months to prevent clogs and maintain performance.

Can a clogged air gap cause drainage issues?

Yes, a blocked air gap can prevent water from draining properly.

How do I know if the drain pump is faulty?

If the pump doesn't run during the drain cycle or makes unusual noises, it may be faulty.

Can I replace the drain pump myself?

Yes, if you're comfortable with basic repairs, but ensure you follow safety precautions and the manufacturer's instructions.

Why is my dishwasher making gurgling noises during the drain cycle?

Gurgling noises may indicate a clog in the drain hose or air gap.