Dishwasher Not Draining at End of Cycle: Troubleshooting Guide
Quick answer
First, check if the drain hose is kinked or clogged. Ensure the drain filter is clean. If these are clear, inspect the drain pump for blockages or failure.
Confirm the symptom
- Dishwasher leaves standing water at the end of the cycle.
- Dishes are not clean due to poor drainage.
- Dishwasher makes unusual noises during the drain cycle.
- Drain hose is disconnected or improperly installed.
Tools and prep
- screwdriver set — For removing dishwasher panels and accessing internal components.
- bucket
- towel
- flashlight — To see in dark areas under the dishwasher.
- dishwasher drain hose — To replace if the existing hose is damaged or clogged.
- dishwasher drain filter — To replace if the existing filter is damaged or clogged.
- dishwasher drain pump — To replace if the existing pump is faulty.
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Prep & safety
- Ensure the dishwasher is turned off and unplugged from the power source.
- Allow the dishwasher to cool down if it was recently in use.
- Place towels around the dishwasher to absorb any water that may spill.
- Clear the area around the dishwasher for easy access.
Step-by-step troubleshooting
Check the Drain Hose
Do: Locate the drain hose at the back of the dishwasher.
Observe: Inspect for kinks, clogs, or damage.
Means: Straighten any kinks and clear any clogs.
Next: If the hose is damaged, replace it.
Clean the Drain Filter
Do: Remove the lower rack of the dishwasher.
Observe: Locate the drain filter at the back of the dishwasher tub.
Means: Remove the filter and clean it thoroughly.
Next: Reinstall the filter and run a test cycle.
Inspect the Drain Pump
Do: Access the drain pump, usually located at the bottom of the dishwasher.
Observe: Check for blockages or signs of failure.
Means: Clear any blockages or replace the pump if necessary.
Next: Reassemble the dishwasher and run a test cycle.
Check the Air Gap
Do: Locate the air gap on the kitchen counter or sink.
Observe: Ensure it is not clogged with debris.
Means: Clean the air gap if necessary.
Next: Run a test cycle to see if the issue is resolved.
Inspect the Drain Valve
Do: Locate the drain valve, usually near the drain pump.
Observe: Check for blockages or signs of failure.
Means: Clear any blockages or replace the valve if necessary.
Next: Reassemble the dishwasher and run a test cycle.
Check the Garbage Disposal
Do: Ensure the garbage disposal is functioning properly.
Observe: Look for any clogs or issues.
Means: Clear any clogs or repair the disposal if necessary.
Next: Run the dishwasher to see if the issue is resolved.
Inspect the Check Valve
Do: Locate the check valve, usually near the drain pump.
Observe: Ensure it is functioning properly.
Means: Replace the check valve if it is faulty.
Next: Reassemble the dishwasher and run a test cycle.
Check the Control Board
Do: Inspect the control board for any signs of damage.
Observe: Look for burnt components or loose wires.
Means: Replace the control board if necessary.
Next: Reassemble the dishwasher and run a test cycle.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged Drain Hose | Food particles or debris can block the hose. | High | Low | Dishwasher drain hose |
| Dirty Drain Filter | The filter can become clogged with food particles. | High | Low | Dishwasher drain filter |
| Faulty Drain Pump | The pump may fail due to wear and tear. | Medium | Medium | Dishwasher drain pump |
| Clogged Air Gap | Debris can accumulate and block the air gap. | Medium | Low | None |
| Faulty Drain Valve | The valve may fail to open or close properly. | Medium | Medium | Drain valve |
| Garbage Disposal Issues | A clogged or malfunctioning disposal can affect drainage. | Medium | Medium | None |
| Faulty Check Valve | The check valve may fail to prevent backflow. | Low | Medium | Check valve |
| Control Board Failure | The control board may have burnt components or loose wires. | Low | High | Control board |
Parts matching
When replacing parts, ensure they match your dishwasher's make and model.
- Drain hose: Match the length and diameter (e.g., 3/4 inch, 6 feet).
- Drain filter: Match the size and type (e.g., cylindrical, flat).
- Drain pump: Match the voltage and horsepower (e.g., 120V, 1/2 HP).
- Air gap: Match the type and connection size (e.g., 3/4 inch, 1-1/2 inch).
- Drain valve: Match the voltage and connection type (e.g., 120V, solenoid).
- Check valve: Match the size and connection type (e.g., 3/4 inch, push-fit).
- Control board: Match the model number and voltage (e.g., Model XYZ, 120V).
Consult your dishwasher's manual for specific part numbers and compatibility.
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When to call a pro
- If the dishwasher is under warranty.
- If you are not comfortable performing the repairs yourself.
- If the issue persists after troubleshooting.
- If the dishwasher is leaking water.
- If there are signs of electrical issues, such as sparks or burning smells.
- If the dishwasher is making unusual noises that indicate a serious problem.
FAQ
Why is my dishwasher not draining?
Common causes include a clogged drain hose, dirty drain filter, or faulty drain pump.
How do I clean the dishwasher drain filter?
Remove the lower rack, locate the filter at the back of the tub, and clean it thoroughly.
What should I do if the drain hose is damaged?
Replace the drain hose with a new one that matches the length and diameter of the original.
Can I use a garbage disposal with my dishwasher?
Yes, but ensure the disposal is functioning properly and not clogged.
How do I know if the drain pump is faulty?
Check for blockages or signs of failure, such as unusual noises or lack of water movement.
What is an air gap and why is it important?
An air gap prevents backflow into the dishwasher. Ensure it is clean and functioning properly.