Quick answer
Check the drain hose for clogs, ensure the air gap is clear, and verify the drain pump is working. If the issue persists, the pump or float switch may need replacement.
Confirm the symptom
- Water remains in the bottom of the dishwasher after cycles
- Dishes are not drying properly
- Dishwasher leaks water onto the floor
- Error code related to drainage appears on the display
Tools and prep
- Screwdriver set
- Plunger or wet/dry vacuum
- Bucket
- Flashlight
- Work gloves
- Turn off power at the circuit breaker
- Shut off water supply to the dishwasher
Step-by-step troubleshooting
- Check Drain HoseDo: Locate and inspect the drain hose for kinks or clogs.Observe: Hose is clear and free of obstructions.Means: Drain hose is not the issue.Next: Check Air Gap
- Check Air GapDo: Clean the air gap by removing the cap and using a brush or pipe cleaner to clear debris.Observe: Air gap is clear and functioning.Means: Air gap was clogged.Next: Check Drain Pump
- Check Drain PumpDo: Inspect the drain pump for clogs or damage. Remove any debris found.Observe: Pump spins freely and shows no signs of damage.Means: Drain pump is working.Next: Test Float Switch
- Test Float SwitchDo: Lift the float switch to see if it moves freely and resets.Observe: Float moves up and down without resistance.Means: Float switch is functioning.Next: Check for Error Codes
- Check for Error CodesDo: Consult the user manual to interpret any displayed error codes related to drainage.Observe: Error code is identified and understood.Means: Error code provides specific guidance.Next: Call a Professional
- Call a ProfessionalDo: Contact a licensed appliance repair technician for further diagnosis and repair.Observe: Professional assessment is scheduled.Means: Issue requires expert attention.Next: None
Common causes
| Cause | Likelihood | Difficulty | Part often needed |
|---|---|---|---|
| Clogged Drain Hose Food particles or debris can block the hose, preventing water from draining. | Common | Easy | None |
| Clogged Air Gap Debris can accumulate in the air gap, restricting water flow. | Common | Easy | None |
| Faulty Drain Pump A damaged or malfunctioning drain pump cannot move water out of the dishwasher. | Sometimes | Medium | Drain Pump |
| Stuck Float Switch A float switch that is stuck or damaged can prevent the pump from activating. | Sometimes | Easy | Float Switch |
| Blocked Drain Filter A clogged drain filter can impede water flow and cause drainage issues. | Sometimes | Easy | Drain Filter |
| Incorrect Installation Improper installation of the drain hose or air gap can lead to drainage problems. | Rare | Medium | None |
| Electrical Issues A faulty wiring connection or circuit board can prevent the drain pump from operating. | Rare | Hard | Control Board |
Parts matching
Common parts that may be needed to fix a dishwasher that won't drain include:
- Drain Pump
- Float Switch
- Drain Filter
- Air Gap Assembly
- Control Board
Always refer to your dishwasher's user manual for specific part numbers and compatibility.
When to call a professional
- Water continues to pool in the dishwasher after checking all components
- You hear the drain pump running but water is not draining
- You are unsure about electrical connections or internal components
- Error codes persist after troubleshooting
- You suspect a major part failure like the control board
FAQ
How often should I clean the drain filter?
Clean the drain filter every 1-2 months to prevent clogs and maintain proper drainage.
Can I use a plunger to unclog the drain hose?
Yes, a plunger can help clear minor clogs in the drain hose. Ensure the hose is properly connected afterward.
What is an air gap, and why is it important?
An air gap is a device that prevents backflow of water into the dishwasher. It's important for preventing contamination and ensuring proper drainage.
How do I know if the drain pump is faulty?
If the pump is making noise but not moving water, or if there is no noise at all, the pump may be faulty and need replacement.
Can a clogged drain filter cause the dishwasher to not drain?
Yes, a clogged drain filter can restrict water flow and lead to drainage issues. Regular cleaning is essential.