Dishwasher Not Draining from the Bottom: Troubleshooting Guide
Quick answer
First, check if the dishwasher is level. Then, inspect the drain filter and drain hose for clogs. If these are clear, you may need to replace the drain pump.
Confirm the symptom
- Water remains in the bottom of the dishwasher after the cycle ends.
- Dishwasher makes unusual noises during the drain cycle.
- Dishes are not getting clean due to standing water.
- Error code related to draining appears on the dishwasher's display.
- Dishwasher takes longer than usual to complete a cycle.
Tools and prep
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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.
- Clear the area around the dishwasher for easy access.
- Gather the necessary tools and parts for the troubleshooting process.
Step-by-step troubleshooting
Check for Leveling
Do: Use a level to check if the dishwasher is properly leveled.
Observe: If the dishwasher is not level, water may not drain properly.
Means: Adjust the leveling legs until the dishwasher is balanced.
Next: Check the drain filter.
Check the Drain Filter
Do: Locate the drain filter at the back of the dishwasher's bottom interior.
Observe: Remove the filter and check for any debris or blockages.
Means: Clean the filter thoroughly with warm, soapy water.
Next: Inspect the drain hose.
Inspect the Drain Hose
Do: Locate the drain hose at the back of the dishwasher.
Observe: Check for any kinks, clogs, or damage.
Means: Straighten any kinks and clear any clogs. Replace the hose if damaged.
Next: Check the drain pump.
Check the Drain Pump
Do: Locate the drain pump, usually at the bottom of the dishwasher.
Observe: Listen for any unusual noises when the dishwasher is running.
Means: If the pump is noisy or not working, it may need replacement.
Next: Inspect the air gap.
Inspect the Air Gap
Do: Locate the air gap on the kitchen counter or sink.
Observe: Check for any blockages or debris.
Means: Clean the air gap and ensure it is functioning properly.
Next: Check the garbage disposal.
Check the Garbage Disposal
Do: Ensure the garbage disposal is functioning properly.
Observe: If the disposal is clogged, it can affect the dishwasher's draining.
Means: Run the disposal with water to clear any blockages.
Next: Test the dishwasher.
Test the Dishwasher
Do: Run a short cycle to see if the issue is resolved.
Observe: Monitor the dishwasher for proper draining.
Means: If the problem persists, further inspection or professional help may be needed.
Next: None
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged Drain Filter | Food particles and debris can accumulate and block the filter. | High | Easy | None |
| Kinked or Clogged Drain Hose | The hose can get kinked or clogged with debris over time. | Medium | Medium | Drain hose |
| Faulty Drain Pump | The pump may wear out or fail, preventing proper draining. | Medium | Hard | Drain pump |
| Blocked Air Gap | The air gap can get clogged with debris, affecting drainage. | Medium | Easy | None |
| Garbage Disposal Issues | A clogged or malfunctioning disposal can affect dishwasher drainage. | Low | Medium | None |
| Improper Leveling | If the dishwasher is not level, water may not drain properly. | Low | Easy | None |
| Faulty Control Board | The control board may malfunction, affecting the drain cycle. | Low | Hard | Control board |
Parts matching
When replacing parts, ensure they match your dishwasher's make and model.
- Drain pump: Match the model and voltage specifications of your dishwasher.
- Drain hose: Ensure the correct length and diameter for your dishwasher.
- Air gap: Match the type and size compatible with your sink and dishwasher.
- Control board: Verify the exact model number and compatibility with your dishwasher.
Always refer to your dishwasher's user manual for specific part numbers and compatibility.
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When to call a pro
- If the dishwasher is still not draining after troubleshooting.
- If you suspect a major component failure, like the control board.
- If you are not comfortable performing the repairs yourself.
- If the dishwasher is under warranty, to avoid voiding it.
- If there are electrical issues or water leaks present.
- If the problem persists after replacing suspected parts.
FAQ
Why is my dishwasher not draining?
Common causes include a clogged drain filter, kinked drain hose, faulty drain pump, or blocked air gap.
How do I clean the drain filter?
Remove the filter from the dishwasher, rinse it under warm water, and use a soft brush to remove any debris.
What should I do if the drain hose is clogged?
Disconnect the hose from the dishwasher and use a plumber's snake or compressed air to clear the clog.
Can I replace the drain pump myself?
If you have the necessary tools and skills, you can replace the drain pump. However, it may be best to consult a professional for this task.