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Quick answer
First, turn off the power and check the drain hose for clogs. Clear the filter and inspect the drain pump. If the issue persists, the pump or float switch may need replacement.
Confirm the symptom
- Standing water in the bottom of the dishwasher after cycles
- Dishes are not drying properly
- Dishwasher leaks water onto the floor
- Unusual gurgling or humming sounds during drain cycle
Tools and prep
- Screwdriver (flathead and Phillips)
- Flashlight
- Bucket or towel
- Plumber's putty or silicone sealant
- Replacement drain pump (if needed)
- Safety gloves
- Turn off power at circuit breaker
- Shut off water supply to dishwasher
Step-by-step troubleshooting
- Check for Standing WaterDo: Open the dishwasher door and look for standing water in the bottom.Observe: Water pooled at the bottom indicates a drainage issue.Means: The drain system is blocked or malfunctioning.Next: Inspect the drain hose
- Inspect the Drain HoseDo: Locate the drain hose at the back of the dishwasher and check for kinks, clogs, or blockages.Observe: Clogs or kinks prevent proper drainage.Means: Clear the hose or replace if damaged.Next: Clean the filter
- Clean the FilterDo: Remove the filter at the bottom of the dishwasher and clean it under running water.Observe: Food particles and debris may be clogging the filter.Means: A clogged filter can impede drainage.Next: Check the drain pump
- Check the Drain PumpDo: Locate the drain pump (usually at the bottom of the dishwasher) and inspect for damage or blockages.Observe: A damaged or clogged pump will not drain water.Means: The pump may need cleaning or replacement.Next: Test the float switch
- Test the Float SwitchDo: Lift the float switch to see if it moves freely and resets.Observe: If the float is stuck or damaged, it can prevent the dishwasher from draining.Means: A faulty float switch needs replacement.Next: Replace the drain pump if necessary
- Replace the Drain PumpDo: Disconnect the old drain pump and install the new one following the manufacturer's instructions.Observe: The dishwasher should drain properly after replacement.Means: The drain pump was the cause of the issue.Next: Finish
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Hose Food particles or debris block the hose, preventing water from draining. | Common | Easy | None |
| Clogged Filter Accumulated debris in the filter restricts water flow. | Common | Easy | None |
| Faulty Drain Pump A damaged or worn-out pump cannot effectively pump water out. | Sometimes | Medium | Drain Pump |
| Stuck Float Switch A float switch that is stuck or damaged prevents the dishwasher from draining. | Sometimes | Easy | Float Switch |
| Improper Installation Incorrect installation of the drain hose or pump can cause drainage issues. | Rare | Medium | None |
| Blocked Air Gap An air gap that is clogged can prevent proper drainage. | Sometimes | Easy | None |
| Worn Seals or Gaskets Leaking seals can cause water to pool in the dishwasher. | Rare | Medium | Seal or Gasket |
Parts matching
Common parts needed to fix a dishwasher not draining include:
- Drain Pump
- Float Switch
- Seal or Gasket
- Filter (if damaged and needs replacement)
Purchase parts compatible with your dishwasher model. Refer to the user manual for specific part numbers.
When to call a professional
- Standing water persists after replacing the drain pump
- You hear unusual noises but can't identify the source
- You're unsure about electrical components or complex installations
- The dishwasher leaks water after repairs
- The problem recurs frequently despite multiple fixes
- You don't have the necessary tools or experience to safely complete the repair
FAQ
How do I know if the drain pump is faulty?
If the dishwasher fills with water but doesn't drain, and the pump is clogged or damaged, it likely needs replacement.
Can a clogged air gap cause drainage issues?
Yes, a clogged air gap can prevent proper drainage. Clean it with a brush or pipe cleaner.
How often should I clean the dishwasher filter?
Clean the filter every 1–2 months to prevent clogs and maintain performance.
What should I do if the float switch is stuck?
Try to manually reset it. If it's damaged, replace the float switch.
Why is my dishwasher making gurgling sounds during the drain cycle?
Gurgling sounds may indicate a clogged drain hose or air trapped in the system.