Dishwasher Not Completely Draining Whirlpool (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

If your Whirlpool dishwasher isn't draining completely, check the drain hose for kinks or clogs, clean the filter, and ensure the air gap is clear. If these steps don’t resolve the issue, the drain pump or float switch may need inspection.

Confirm the symptom

Water remains in the bottom of the dishwasher after cycles complete
Dishes are still wet despite a completed cycle
Dishwasher emits a gurgling or bubbling sound during drainage

Tools and prep

Screwdriver (Phillips and flathead)
Plumber’s putty or silicone sealant
Bucket or container for water collection
Flashlight for visibility
Work gloves for protection
Turn off power at the circuit breaker for safety
Shut off water supply to the dishwasher

Step-by-step troubleshooting

Inspect the Drain Hose
Do: Locate and examine the drain hose for kinks, clogs, or damage. Disconnect the hose and check for blockages.
Observe: Water flow obstruction or debris buildup
Means: A clogged or damaged hose is preventing proper drainage.
Next: Clean or replace the hose if necessary.
Clean the Dishwasher Filter
Do: Remove the bottom filter and rinse it under running water to clear food particles and debris.
Observe: Visible debris or blockage in the filter
Means: A clogged filter restricts water flow.
Next: Reinstall the filter and test the dishwasher.
Check the Air Gap
Do: Inspect the air gap on the countertop for clogs. Remove the cap and clear any debris with a wire or brush.
Observe: Debris or standing water in the air gap
Means: A blocked air gap hinders drainage.
Next: Flush the air gap and reassemble.
Test the Drain Pump
Do: Listen for the drain pump during operation. If it’s silent, the pump may be faulty.
Observe: No sound from the drain pump during drainage
Means: A failed drain pump is likely the issue.
Next: Use a multimeter to test for continuity; replace if necessary.
Examine the Float Switch
Do: Check the float switch for obstructions or damage. Ensure it moves freely.
Observe: Float switch stuck in the up position
Means: A stuck float switch prevents the pump from activating.
Next: Clean or replace the float switch.
Verify Proper Installation
Do: Ensure the drain hose is properly connected and not kinked. Check that the dishwasher is level.
Observe: Improper hose connection or uneven appliance
Means: Installation issues can disrupt drainage.
Next: Adjust the hose and level the dishwasher if needed.
Run a Diagnostic Cycle
Do: Consult your Whirlpool manual for diagnostic mode instructions and run a test cycle.
Observe: Error codes or specific drainage behavior
Means: Built-in diagnostics can identify the issue.
Next: Follow manual guidance for error code resolution.
Inspect for Leaks
Do: Check under the dishwasher and around connections for water leaks.
Observe: Water pooling or damp areas near the appliance
Means: Leaks can indicate a more serious issue.
Next: Tighten connections or replace damaged parts.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Drain Hose Debris or kinks in the hose block water flow.	Common	Easy	Drain Hose
Clogged Filter Food particles and debris block the filter.	Common	Easy	Dishwasher Filter
Blocked Air Gap Debris in the air gap prevents proper drainage.	Sometimes	Easy	Air Gap
Faulty Drain Pump A malfunctioning pump can't move water out.	Sometimes	Medium	Drain Pump
Stuck Float Switch A stuck float prevents the pump from activating.	Sometimes	Medium	Float Switch
Improper Installation Kinked hose or unlevel appliance disrupts drainage.	Sometimes	Easy	Drain Hose
Leak in Hose or Connections Leaks can cause water to pool instead of drain.	Rare	Medium	Hose or Seal
Control Board Issue A faulty control board may not activate the drain pump.	Rare	Hard	Control Board

Parts matching

Common replacement parts for this issue include:

Drain Hose – Replace if kinked or clogged
Dishwasher Filter – Clean or replace if clogged
Air Gap – Clear or replace if blocked
Drain Pump – Replace if faulty or silent
Float Switch – Replace if stuck or damaged
Hose Seal – Replace if leaking

Always purchase OEM (Original Equipment Manufacturer) parts for compatibility and performance.

When to call a professional

Water continues to pool after cleaning all components
Drain pump shows no continuity and you're unsure about replacement
Error codes persist after troubleshooting
You notice a strong odor or mold growth indicating a serious blockage
You hear unusual noises like grinding or loud humming from the pump

FAQ

How often should I clean my 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 proper drainage and lead to water pooling in the dishwasher.

What tools do I need to replace a drain pump?

You'll typically need a screwdriver, multimeter, and possibly a wrench to disconnect hoses.

Why is my dishwasher making a gurgling noise during drainage?

Gurgling sounds often indicate a clogged drain hose or air gap, restricting water flow.

Is it safe to use a drain cleaner in my dishwasher?

No, chemical drain cleaners can damage the dishwasher’s components. Use hot water and a brush instead.