Dishwasher Not Draining: Troubleshooting Steps
Quick answer
First, check if the drain hose is kinked or clogged. Then, inspect the drain filter and drain pump for blockages. If these are clear, you may need to replace the drain pump or call a professional.
Confirm the symptom
- Dishwasher leaves standing water at the bottom.
- Dishes are not getting clean due to poor drainage.
- Dishwasher makes unusual noises during the drain cycle.
- Error code related to draining appears on the control panel.
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.
- Put on gloves to protect your hands from any debris or sharp edges.
Step-by-step troubleshooting
Check the Drain Hose
Do: Locate the drain hose at the back of the dishwasher.
Observe: Look for any kinks, blockages, or damage.
Means: Straighten any kinks and clear any blockages.
Next: Inspect the drain filter.
Inspect the Drain Filter
Do: Remove the lower rack and locate the drain filter at the back of the dishwasher tub.
Observe: Check for any food particles or debris.
Means: Clean the filter thoroughly with warm, soapy water.
Next: Check the drain pump.
Check the Drain Pump
Do: Access the drain pump, usually located at the bottom of the dishwasher.
Observe: Look for any blockages or damage.
Means: Clear any blockages and ensure the pump spins freely.
Next: Test the dishwasher.
Test the Dishwasher
Do: Plug the dishwasher back in and run a short cycle.
Observe: Monitor the dishwasher to see if it drains properly.
Means: If it drains, the issue is resolved. If not, proceed to the next step.
Next: Check the air gap.
Check the Air Gap
Do: Locate the air gap on the countertop or sink.
Observe: Ensure it is not clogged with debris.
Means: Clean the air gap if necessary.
Next: Inspect the garbage disposal.
Inspect the Garbage Disposal
Do: Check the garbage disposal for any blockages.
Observe: Ensure it is functioning properly.
Means: Run the disposal to clear any blockages.
Next: Check the sink drain.
Check the Sink Drain
Do: Ensure the sink drain is not clogged.
Observe: Look for any blockages or issues.
Means: Clear any blockages in the sink drain.
Next: Replace the drain pump if necessary.
Replace the Drain Pump
Do: If the drain pump is faulty, replace it with a new one.
Observe: Ensure the new pump is compatible with your dishwasher model.
Means: Follow the manufacturer's instructions for replacement.
Next: Test the dishwasher again.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Kinked or Clogged Drain Hose | Prevents water from draining properly. | High | Low | Drain hose |
| Clogged Drain Filter | Food particles and debris block the filter. | High | Low | Drain filter |
| Faulty Drain Pump | The pump may be damaged or worn out. | Medium | Medium | Drain pump |
| Clogged Air Gap | Prevents proper drainage through the air gap. | Medium | Low | Air gap |
| Blocked Garbage Disposal | Prevents water from draining into the disposal. | Medium | Low | None |
| Clogged Sink Drain | Prevents water from draining from the dishwasher. | Medium | Low | None |
| Faulty Control Board | The control board may not be sending the correct signals. | Low | High | Control board |
Parts matching
When replacing parts, ensure they match your dishwasher's make and model. Here are some key parts to consider:
- Drain hose: Match the length and diameter (e.g., 3/4 inch, 6 feet).
- Drain filter: Match the size and shape specific to your dishwasher model.
- Drain pump: Match the voltage, horsepower, and compatibility with your dishwasher model.
- Air gap: Match the size and type (e.g., 3/4 inch, brass).
- Control board: Match the part number and compatibility with your dishwasher model.
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 are not comfortable performing the repairs yourself.
- If the dishwasher is under warranty.
- If there are signs of water damage or electrical issues.
- If the dishwasher is making unusual noises.
- If you suspect a more complex issue, such as a faulty control board.
FAQ
Why is my dishwasher not draining?
Common causes include a kinked or clogged drain hose, a clogged drain filter, or a faulty drain pump.
How do I clean the drain filter?
Remove the lower rack and locate the drain filter at the back of the dishwasher tub. Clean it thoroughly with warm, soapy water.
Can I use a plunger to unclog the dishwasher?
Yes, you can use a plunger to try and clear any blockages in the drain hose or sink drain.
What should I do if the drain pump is faulty?
If the drain pump is faulty, you will need to replace it with a new one that is compatible with your dishwasher model.