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Quick answer
If your dishwasher isn't draining, first check the drain hose for clogs and ensure the air gap is clear. Clearing these blockages often resolves the issue quickly.
Confirm the symptom
- Standing water in the bottom of the dishwasher after cycles
- Dishes remain wet or soapy after a cycle
- Unusual gurgling or bubbling sounds during drainage
Tools and prep
- Screwdriver (flathead or Phillips, depending on model)
- Plumber's putty or silicone sealant
- Bucket or container for water collection
- Flashlight for inspecting hard-to-see areas
- Rubber gloves for handling dirty parts
- Turn off power at circuit breaker for safety
- Shut off water supply to the dishwasher
Step-by-step troubleshooting
- Check for Standing WaterDo: Open the dishwasher door and look for water pooled at the bottom.Observe: Water level after a completed cycleMeans: Water indicates a drainage problem.Next: Inspect the drain hose
- Inspect the Drain HoseDo: Locate the drain hose under the sink and check for kinks or clogs.Observe: Blockages or kinks in the hoseMeans: A clogged or kinked hose restricts water flow.Next: Clear the clog or straighten the hose
- Clean the Air GapDo: Remove the air gap cover and use a brush to clear debris.Observe: Debris or standing water in the air gapMeans: A clogged air gap prevents proper drainage.Next: Flush the air gap with water
- Check the Drain PumpDo: Access the drain pump (usually at the bottom of the dishwasher) and inspect for debris.Observe: Debris or damage in the pumpMeans: A clogged or faulty pump can't drain water.Next: Clean the pump or replace if damaged
- Verify Drain Hose InstallationDo: Ensure the hose is properly connected and not too high or low.Observe: Improper hose height or connectionsMeans: Incorrect installation hinders drainage.Next: Adjust the hose to the correct height
- Test the DishwasherDo: Restart the dishwasher and run a cycle to see if it drains properly.Observe: Drainage during the cycleMeans: Successful drainage confirms the fix.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 Air Gap Debris in the air gap prevents water from exiting. | Common | Easy | None |
| Clogged Drain Pump Debris in the pump stops it from functioning. | Sometimes | Easy–Medium | Drain Pump |
| Faulty Drain Pump A broken pump can't move water out. | Sometimes | Medium | Drain Pump |
| Improper Hose Installation Hose height or kinks restrict drainage. | Sometimes | Easy | None |
| Blocked Garbage Disposal If connected, a clogged disposal prevents drainage. | Rare | Medium | None |
| Faulty Float Switch A broken float switch can't signal the pump to drain. | Rare | Hard | Float Switch |
Parts matching
If you need to replace parts, look for these components:
- Drain Pump (common replacement for clogs or damage)
- Air Gap Cover (if damaged or missing)
- Drain Hose (if cracked or collapsed)
Check your dishwasher’s model number for exact part compatibility.
When to call a professional
- Water continues to pool after clearing all clogs
- Drain pump makes loud noises or doesn’t run at all
- You can’t access or repair internal components safely
- The dishwasher is under warranty and you don’t want to risk voiding it
- Standing water causes mold or mildew smells
FAQ
How often should I clean my dishwasher’s drain?
Clean the drain and air gap every 3–6 months to prevent clogs.
Can a clogged garbage disposal cause drainage issues?
Yes, if your dishwasher drains into a disposal, a blockage there will prevent proper drainage.
Why is my dishwasher draining slowly?
Slow drainage is often due to a partially clogged hose, air gap, or pump.
Is it safe to use a drain cleaner on my dishwasher’s drain?
Avoid chemical drain cleaners, as they can damage dishwasher components. Use hot water and a brush instead.
Can a bad float switch cause water to remain in the dishwasher?
Yes, a faulty float switch may fail to activate the drain pump, leaving water in the tub.