Whirlpool Dishwasher Not Draining Fix (Troubleshooting Guide)

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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

To fix a Whirlpool dishwasher that won't drain, first check for a clogged drain filter or hose. Clear any blockages, ensure the drain pump is working, and verify the air gap is clear. If the problem persists, the pump or float switch may need replacement.

Confirm the symptom

Water remains in the bottom of the dishwasher after cycles.
Dishes are not drying properly due to standing water.
Dishwasher error code indicates a drain issue.

Tools and prep

Screwdriver (flathead and Phillips)
Flashlight
Plunger (optional)
Bucket (for water removal)
Work gloves
Turn off power at the circuit breaker.
Shut off water supply to the dishwasher.

Step-by-step troubleshooting

Check and Clear the Drain Filter
Do: Locate the drain filter at the bottom of the dishwasher tub and remove it. Use a brush or cloth to clean out food particles and debris.
Observe: The filter is free of clogs and debris.
Means: A clogged filter can prevent proper drainage.
Next: If the filter is clear, move to the next step.
Inspect the Drain Hose
Do: Check the drain hose for kinks, clogs, or blockages. Straighten any kinks and use a brush or pipe cleaner to remove debris.
Observe: The hose is free of kinks and blockages.
Means: A blocked or kinked hose restricts water flow.
Next: If the hose is clear, proceed to the next step.
Check the Air Gap (if applicable)
Do: Locate the air gap on the countertop and remove the cap. Use a brush or pipe cleaner to clear any debris inside.
Observe: The air gap is clear and unobstructed.
Means: A clogged air gap prevents proper drainage.
Next: If the air gap is clear, continue to the next step.
Test the Drain Pump
Do: Listen for the drain pump during a cycle. If it's not running, unplug the dishwasher and check the pump for blockages or damage.
Observe: The pump is running or is free of debris.
Means: A faulty or clogged pump can cause drainage issues.
Next: If the pump is not working, consider replacing it.
Inspect the Float Switch
Do: Check the float switch near the drain pump. Ensure it moves freely and is not stuck in the up position.
Observe: The float switch moves up and down without obstruction.
Means: A stuck float switch can prevent the pump from operating.
Next: If the float switch is faulty, it may need replacement.
Check for Error Codes
Do: Consult the user manual to interpret any error codes displayed on the dishwasher control panel.
Observe: You understand the meaning of the error code.
Means: Error codes can provide specific guidance for troubleshooting.
Next: Follow the manual's recommendations for the specific error code.
Run a Diagnostic Cycle
Do: Refer to the user manual for instructions on running a diagnostic cycle to identify specific issues.
Observe: The diagnostic cycle completes without errors.
Means: A diagnostic cycle can pinpoint internal problems.
Next: If errors persist, consider professional assistance.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Drain Filter Food particles and debris accumulate in the filter, blocking water flow.	Common	Easy	Drain filter (if damaged)
Clogged Drain Hose Debris or kinks in the hose restrict water flow.	Common	Easy–Medium	None (usually just cleaning)
Clogged Air Gap Debris in the air gap prevents proper drainage.	Sometimes	Easy	None (usually just cleaning)
Faulty Drain Pump The pump motor or impeller is damaged or clogged.	Sometimes	Medium	Drain pump
Stuck Float Switch The float switch is obstructed or damaged, preventing the pump from operating.	Sometimes	Medium	Float switch
Blocked Drain Line The drain line leading to the sink or disposal is clogged.	Sometimes	Medium	None (usually just cleaning)
Incorrect Installation Improper installation of the drain hose or pump.	Rare	Hard	Drain hose or pump
Control Board Issue The control board is malfunctioning and not activating the drain pump.	Rare	Hard	Control board

Parts matching

If parts need replacement, match these common Whirlpool dishwasher parts:

Drain Filter – Model-specific filter for the dishwasher tub.
Drain Pump – Compatible with your Whirlpool model (check model number).
Float Switch – Ensure compatibility with your dishwasher model.
Air Gap Cap – If the existing cap is damaged or missing.
Drain Hose – Use the manufacturer-recommended hose for your model.

Always refer to your dishwasher’s user manual for the correct part numbers and specifications.

When to call a professional

Water continues to remain in the dishwasher after following all troubleshooting steps.
The drain pump is damaged and you are unable to replace it yourself.
Error codes persist despite clearing clogs and checking components.
Standing water causes a foul odor or mold growth.
You are unsure about electrical components or control board issues.

FAQ

How often should I clean the drain filter?

Clean the drain filter every 1–2 months to prevent clogs and ensure proper drainage.

Can a clogged air gap cause the dishwasher to not drain?

Yes, a clogged air gap can prevent water from draining properly. Clean it regularly to avoid this issue.

What should I do if the drain pump is not working?

If the drain pump is not working, unplug the dishwasher and check for blockages. If it's damaged, it may need to be replaced by a professional.

How do I know if the float switch is faulty?

If the float switch is stuck in the up position or does not move freely, it may be faulty and need replacement.

Can I use a plunger to clear a clogged drain hose?

Yes, a plunger can help clear minor clogs in the drain hose. Ensure the hose is properly reconnected after plunging.