How to Fix Dishwasher Not Draining (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

Turn off the dishwasher power and water supply. Check the drain hose for clogs, clear the filter, and inspect the pump. If these don't work, the pump or float switch may need replacement.

Confirm the symptom

Water remains in the bottom after a cycle
Dishes are wet despite a completed cycle
Dishwasher leaks from the drain area
Error code related to drainage appears on the display

Tools and prep

Screwdriver (flathead and Phillips)
Plunger or drain snake
Bucket or towel
Flashlight
Needle-nose pliers
Replacement parts if needed
Turn off power at the circuit breaker
Shut off water supply to the dishwasher

Step-by-step troubleshooting

Check the Drain Hose
Do: Locate the drain hose at the back of the dishwasher and disconnect it. Inspect for clogs or kinks.
Observe: Observe if water drains freely or if there's a blockage.
Means: A clog or kink in the hose prevents proper drainage.
Next: If clogged, clear the blockage with a drain snake or plunger.
Clean the Filter
Do: Remove the filter at the bottom of the dishwasher and clean it under running water.
Observe: Check for food particles or debris.
Means: A dirty filter can restrict water flow.
Next: Reinstall the clean filter and run a test cycle.
Inspect the Pump
Do: Access the pump (usually at the bottom rear of the dishwasher) and check for debris or damage.
Observe: Look for blockages or signs of wear.
Means: A clogged or faulty pump can't push water out.
Next: If clogged, remove debris. If damaged, consider replacing the pump.
Check the Float Switch
Do: Locate the float switch (near the bottom of the dishwasher) and ensure it moves freely.
Observe: Check if the float is stuck or damaged.
Means: A stuck float can prevent the pump from activating.
Next: If stuck, clean or adjust it. If damaged, replace the float switch.
Verify Drain Pipe Installation
Do: Ensure the drain hose is properly connected to the sink or disposal and not kinked.
Observe: Check for correct height and secure connections.
Means: Improper installation can cause drainage issues.
Next: Adjust or reattach the hose as needed.
Test the Dishwasher
Do: Restore power and water supply, then run a test cycle.
Observe: Monitor for proper drainage and leaks.
Means: This confirms if the issue is resolved.
Next: If still not draining, consider professional help.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Drain Hose Food particles or debris block water flow.	Common	Easy	None
Dirty Filter Accumulated debris restricts water flow.	Common	Easy	None
Clogged Pump Debris enters the pump and blocks water discharge.	Sometimes	Medium	Pump
Faulty Float Switch The float gets stuck, preventing the pump from activating.	Sometimes	Medium	Float Switch
Improper Drain Hose Installation Hose is kinked, too high, or not connected properly.	Sometimes	Easy	None
Failed Pump Motor The pump motor burns out and can't push water out.	Rare	Hard	Pump Motor
Blocked Air Gap Air gap prevents proper drainage if clogged.	Rare	Medium	None
Faulty Control Board Malfunctioning control board fails to activate the pump.	Rare	Hard	Control Board

Parts matching

If you need replacement parts, match these common components:

Pump Assembly – Replaces a clogged or failed pump
Float Switch – Fixes a stuck or broken float
Drain Hose – Replaces a damaged or kinked hose
Filter – Replaces a worn or damaged filter
Pump Motor – Replaces a failed motor in the pump assembly
Control Board – Addresses electrical issues preventing pump activation

Check your dishwasher model number for exact part compatibility.

When to call a professional

Water continues to pool after clearing all clogs
Pump makes loud noises or doesn't activate at all
Error codes persist after troubleshooting
You're unable to access or replace internal parts safely
Dishwasher leaks excessively after repairs

FAQ

Why is my dishwasher not draining even after cleaning the filter?

A clogged drain hose or faulty pump could still be the issue. Check the hose and pump for blockages or damage.

Can a high drain hose cause drainage problems?

Yes, if the hose is too high, it can create a siphon effect. Ensure the hose is installed at the correct height as per the manufacturer's guidelines.

How often should I clean the dishwasher filter?

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

What tools do I need to replace a dishwasher pump?

You'll need a screwdriver, pliers, and possibly a wrench. Always turn off power and water before starting.

Is it worth repairing an old dishwasher that won't drain?

If the repair cost is less than 50% of a new unit, it's usually worth fixing. Otherwise, consider replacement.