Quick answer
Turn off power and water. Check the drain hose for clogs, clean the filter, and ensure the pump is working. If water remains, inspect the drain pump or air gap.
Confirm the symptom
- Standing water at the bottom after cycle ends
- Dishes still wet despite full cycle
- Gurgling sounds during drain phase
- Water backs up into sink or floor
Tools and prep
- Screwdriver set
- Flashlight
- Plumber's putty or clamp
- Bucket
- Work gloves
- Turn off power at circuit breaker
- Shut off water supply
Step-by-step troubleshooting
- Check Drain HoseDo: Locate the drain hose under the sink and disconnect it from the dishwasher. Check for clogs or kinks.Observe: Water or debris flows freely from the hose.Means: Hose is clear; issue may be elsewhere.Next: Clean filter
- Clean FilterDo: Remove the bottom rack and access the filter. Twist and lift to remove it. Rinse under running water.Observe: Filter is free of food particles and debris.Means: Clogged filter was causing drainage issue.Next: Test drain
- Test DrainDo: Run a short cycle to see if water drains properly after cleaning filter and hose.Observe: Water drains completely within 5–10 minutes.Means: Issue resolved with basic cleaning.Next: Inspect pump
- Inspect PumpDo: Access the drain pump (usually at the bottom of the dishwasher). Look for obstructions or damage.Observe: Pump spins freely and has no visible damage.Means: Pump is functioning correctly.Next: Check air gap
- Check Air GapDo: If your setup includes an air gap, remove the cap and check for clogs. Clean with a brush and water.Observe: Air gap is clear and unobstructed.Means: Air gap was causing drainage issue.Next: Call professional
- Call ProfessionalDo: If water still doesn't drain, contact a professional for further diagnosis.Observe: No improvement after troubleshooting.Means: Issue may require expert repair or part replacement.Next: End
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged drain hose Food particles or debris block water flow. | Common | Easy | Drain hose |
| Clogged filter Accumulated food particles prevent proper drainage. | Common | Easy | Filter |
| Faulty drain pump Pump motor or impeller is damaged or clogged. | Sometimes | Medium | Drain pump |
| Blocked air gap Air gap prevents proper venting and drainage. | Sometimes | Easy | Air gap |
| Improper installation Drain hose is kinked or improperly connected. | Sometimes | Easy–Medium | Drain hose |
| Failed check valve Valve allows water to backflow into the dishwasher. | Rare | Hard | Check valve |
| Malfunctioning float switch Switch fails to trigger the pump when water is present. | Rare | Medium | Float switch |
Parts matching
Replace these parts if they're damaged or clogged:
- Drain hose – if kinked or clogged
- Filter – if dirty or damaged
- Drain pump – if motor or impeller is faulty
- Air gap – if blocked or damaged
- Check valve – if leaking or faulty
Purchase parts specific to your dishwasher model for compatibility.
When to call a professional
- Water still doesn't drain after cleaning hose, filter, and pump
- Drain pump makes loud noises or doesn't spin
- Standing water persists despite multiple troubleshooting attempts
- You suspect electrical issues or need part replacement beyond your skill level
FAQ
How often should I clean my dishwasher filter?
Clean the filter every 1–2 months to prevent clogs and maintain drainage.
Can a clogged drain hose cause a dishwasher to stop working entirely?
A partially clogged hose may slow drainage but won't stop the dishwasher from operating. Complete blockage can prevent proper drainage and damage components.
Is it safe to use a drain snake on a dishwasher drain hose?
Avoid using drain snakes as they can damage the hose. Instead, flush with hot water or use a small brush to clear debris.
Why does my dishwasher smell bad even after cleaning the filter?
Persistent odors may indicate a deeper clog in the drain hose or pump. Check these areas for trapped debris or mold.
Can a faulty float switch cause water to overflow?
Yes, a faulty float switch may fail to activate the drain pump, leading to water accumulation and potential overflow.