Quick answer
If your dishwasher isn't pumping water, first check the power and water supply. Then inspect the drain hose for clogs and test the drain pump. Replace the pump if necessary.
Confirm the symptom
- Dishes remain wet after cycle ends
- Standing water in the bottom of the dishwasher
- Dishwasher makes gurgling or humming noises but doesn't drain
Tools and prep
- Screwdriver (flathead and Phillips)
- Flashlight
- Bucket or towel
- Plumber's putty
- Multimeter (for testing electrical components)
- Turn off power at circuit breaker
- Shut off water supply to dishwasher
Step-by-step troubleshooting
- Check Power SupplyDo: Ensure the dishwasher is plugged in and the circuit breaker hasn't tripped.Observe: Power indicator lights or motor hum when door is closed.Means: Power is restored.Next: If no power, check electrical connections or call an electrician.
- Inspect Water Supply ValveDo: Locate the water supply valve under the sink and ensure it's fully open.Observe: Water flows freely when the valve is open.Means: Water supply is not restricted.Next: If water doesn't flow, clean or replace the valve.
- Check for Clogged Drain HoseDo: Disconnect the drain hose from the dishwasher and inspect for blockages.Observe: Debris, food particles, or kinks in the hose.Means: Clogged hose is preventing water from draining.Next: Clear the clog and reattach the hose securely.
- Test the Drain PumpDo: Use a multimeter to test the drain pump for continuity.Observe: Multimeter shows no continuity or resistance.Means: Drain pump is faulty and needs replacement.Next: Replace the drain pump following manufacturer instructions.
- Clean the FilterDo: Remove the bottom rack and clean the filter according to the user manual.Observe: Filter is free of debris and spins freely.Means: Clogged filter was restricting water flow.Next: Reinstall the filter and run a test cycle.
- Check for Air Gap IssuesDo: Inspect the air gap device on the countertop for clogs or damage.Observe: Debris or standing water in the air gap.Means: Air gap is not allowing proper drainage.Next: Clean or replace the air gap device.
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Hose Food particles and debris can block the hose, preventing water from draining. | Common | Easy | Drain hose |
| Faulty Drain Pump The pump may fail due to age, wear, or motor issues. | Common | Medium | Drain pump |
| Clogged Filter A dirty filter can restrict water flow and prevent proper drainage. | Sometimes | Easy | Filter |
| Blocked Air Gap An air gap device can become clogged, hindering water drainage. | Sometimes | Easy | Air gap |
| Low Water Supply A closed or partially closed water supply valve can limit water intake. | Rare | Easy | Water supply valve |
| Faulty Water Inlet Valve A defective valve can prevent water from entering the dishwasher. | Rare | Medium | Water inlet valve |
Parts matching
Common parts needed for a dishwasher not pumping water include:
- Drain pump
- Drain hose
- Filter
- Air gap device
- Water supply valve
Always refer to your dishwasher's user manual for part compatibility and installation instructions.
When to call a professional
- If the dishwasher still doesn't pump water after replacing the drain pump and hose
- If you're unable to locate or access the drain pump or other components
- If the issue involves electrical problems beyond basic testing
- If you're unsure about performing the repairs yourself
FAQ
How do I know if my dishwasher's drain pump is faulty?
If the dishwasher fills with water but doesn't drain, and the pump doesn't make a humming noise, the pump is likely faulty and needs replacement.
Can a clogged filter cause a dishwasher not to pump water?
Yes, a clogged filter can restrict water flow and prevent proper drainage. Cleaning or replacing the filter may resolve the issue.
What should I do if my dishwasher's drain hose is clogged?
Disconnect the hose and clear any blockages with a brush or running water. Ensure the hose is properly reconnected and free of kinks.
Why is my dishwasher making noise but not draining?
A noisy dishwasher that doesn't drain may have a clogged drain hose or a faulty drain pump. Check both components for issues.
Is it safe to replace the drain pump myself?
Yes, replacing a drain pump is generally safe if you follow the manufacturer's instructions and ensure the power and water supply are turned off before starting.