Dishwasher Not Draining: Troubleshooting Guide
Quick answer
First, check for clogs in the drain filter and drain hose. Ensure the drain hose is properly connected. If these are clear, you may need to inspect the drain pump or control board. Always ensure the dishwasher is unplugged before starting any repairs.
Confirm the symptom
- Dishwasher leaves standing water at the bottom.
- Dishes are not clean due to poor drainage.
- Dishwasher makes unusual noises during the drain cycle.
- Dishwasher stops mid-cycle and displays an error code.
Tools and prep
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Prep & safety
- Ensure the dishwasher is unplugged or the circuit breaker is turned off.
- Gather the necessary tools and parts.
- Clear the area around the dishwasher for easy access.
- Place a towel and bucket nearby to catch any water spillage.
Step-by-step troubleshooting
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: Reassemble and test the dishwasher.
Inspect the Drain Hose
Do: Locate the drain hose at the back of the dishwasher.
Observe: Check for kinks, clogs, or damage.
Means: Straighten any kinks and clear any clogs. Replace the hose if damaged.
Next: Reconnect the hose and test the dishwasher.
Examine the Air Gap
Do: Locate the air gap on the kitchen counter or sink.
Observe: Check for clogs or blockages.
Means: Clear any debris and ensure water flows freely.
Next: Test the dishwasher to see if it drains properly.
Check the Drain Pump
Do: Access the drain pump, usually located at the bottom of the dishwasher.
Observe: Look for any obstructions or damage.
Means: Clear any debris and test the pump for proper operation. Replace if necessary.
Next: Reassemble and test the dishwasher.
Inspect the Control Board
Do: Locate the control board, often behind the control panel.
Observe: Check for any burnt or damaged components.
Means: Use a multimeter to test for continuity. Replace the control board if faulty.
Next: Reassemble and test the dishwasher.
Check the Float Switch
Do: Locate the float switch inside the dishwasher, usually near the drain.
Observe: Ensure it moves freely and is not stuck.
Means: Clean the float switch and test its operation. Replace if necessary.
Next: Test the dishwasher to see if it drains properly.
Examine the Drain Valve
Do: Locate the drain valve, often near the drain pump.
Observe: Check for any obstructions or damage.
Means: Clear any debris and test the valve for proper operation. Replace if necessary.
Next: Reassemble and test the dishwasher.
Inspect the Check Valve
Do: Locate the check valve in the drain hose.
Observe: Ensure it is not clogged or damaged.
Means: Clean or replace the check valve if necessary.
Next: Reconnect the hose and test the dishwasher.
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 | Drain filter |
| Kinked or Clogged Drain Hose | The hose can become kinked or clogged, preventing proper drainage. | Medium | Easy | Drain hose |
| Faulty Drain Pump | The pump may be clogged or malfunctioning, preventing water from being pumped out. | Medium | Moderate | Drain pump |
| Defective Control Board | The control board may have burnt components, preventing proper operation. | Low | Hard | Control board |
| Stuck Float Switch | The float switch may be stuck, preventing the dishwasher from draining. | Medium | Easy | Float switch |
| Faulty Drain Valve | The drain valve may be clogged or malfunctioning, preventing water from draining. | Medium | Moderate | Drain valve |
| Clogged Check Valve | The check valve may be clogged, preventing proper water flow. | Low | Moderate | Check valve |
Parts matching
When replacing parts, ensure they match the specific model of your dishwasher.
- Drain filter: Match the model number and size of your dishwasher.
- Drain hose: Ensure the length and diameter match your dishwasher's specifications.
- Drain pump: Match the model number and voltage requirements.
- Control board: Ensure compatibility with your dishwasher's make and model.
- Float switch: Match the type and dimensions of your dishwasher's float switch.
- Drain valve: Ensure it fits the drain pump and hose connections.
- Check valve: Match the size and type of your dishwasher's drain hose.
Always refer to 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 problem persists after troubleshooting.
- If you suspect a major component failure, such as the control board.
- If you encounter electrical issues beyond your expertise.
- If the dishwasher is leaking water excessively.
FAQ
Why is my dishwasher not draining?
Common causes include a clogged drain filter, kinked drain hose, or a faulty drain pump. Check these components first.
How do I clean the drain filter?
Remove the filter from the dishwasher, rinse it under warm water, and scrub away any debris. Reinstall and test the dishwasher.
What should I do if the drain hose is kinked?
Straighten the hose and ensure it is properly connected. Replace the hose if it is damaged or frequently kinks.
How do I test the drain pump?
Access the drain pump and check for obstructions. Use a multimeter to test for continuity. Replace the pump if it is faulty.
What is the float switch and how do I check it?
The float switch prevents overfilling. Ensure it moves freely and is not stuck. Clean or replace if necessary.
Can I replace the control board myself?
Replacing the control board can be complex. If you are not experienced with electrical repairs, consider calling a professional.