Bosch Dishwasher Not Emptying Completely: Troubleshooting Guide
Quick answer
Check the drain filter and drain hose for clogs. Ensure the drain pump is functioning properly. If issues persist, inspect the control board or call a professional.
Confirm the symptom
- Water remains in the dishwasher after the cycle ends.
- Dishes are not clean due to standing water.
- Dishwasher makes unusual noises during the drain cycle.
- Error codes related to draining appear on the control panel.
Tools and prep
- screwdriver set — for removing panels and accessing internal components
- multimeter — for testing electrical components
- flashlight — for better visibility in dark areas
- towel — for cleaning and drying components
- bucket — for collecting water during drain hose inspection
- gloves — for protecting hands from water and debris
- dishwasher drain hose — for replacing damaged or clogged hoses
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Prep & safety
- Ensure the dishwasher is unplugged or the circuit breaker is turned off for safety.
- Clear the area around the dishwasher for easy access.
- Gather necessary tools and replacement parts if needed.
- Read the dishwasher's user manual for specific instructions related to your model.
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 debris or blockages.
Means: Use a flashlight for better visibility.
Next: Clean the filter thoroughly and reassemble.
Inspect the Drain Hose
Do: Disconnect the drain hose from the dishwasher and the sink drain.
Observe: Check for kinks, clogs, or damage in the hose.
Means: Use a bucket to collect any water that may spill out.
Next: Replace the hose if necessary and reconnect.
Test the Drain Pump
Do: Access the drain pump, usually located at the bottom of the dishwasher.
Observe: Use a multimeter to test the pump for continuity.
Means: Consult the user manual for specific pump location and testing instructions.
Next: Replace the pump if it is faulty.
Check the Drain Impeller
Do: Locate the drain impeller inside the dishwasher.
Observe: Inspect for damage or blockages.
Means: Remove any debris and ensure the impeller spins freely.
Next: Replace the impeller if it is damaged.
Inspect the Control Board
Do: Access the control board, usually located behind the control panel.
Observe: Look for any signs of damage or burnt components.
Means: Use a multimeter to test for proper voltage and continuity.
Next: Replace the control board if necessary.
Run a Test Cycle
Do: Plug the dishwasher back in and run a test cycle.
Observe: Monitor the dishwasher for proper draining.
Means: Ensure there are no error codes or unusual noises.
Next: If the issue persists, consult a professional.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged Drain Filter | Food particles and debris can accumulate, blocking water flow. | High | Easy | Drain filter |
| Kinked or Clogged Drain Hose | Physical obstructions or damage can prevent proper draining. | Medium | Moderate | Drain hose |
| Faulty Drain Pump | The pump may fail to push water out due to mechanical or electrical issues. | Medium | Moderate | Drain pump |
| Damaged Drain Impeller | The impeller may be blocked or broken, preventing water from being pushed out. | Medium | Moderate | Drain impeller |
| Defective Control Board | Electrical issues can prevent the dishwasher from completing the drain cycle. | Low | Hard | Control board |
| Air Gap Blockage | The air gap can become clogged, preventing water from draining properly. | Low | Easy | Air gap |
| Garbage Disposal Issue | A clogged or malfunctioning garbage disposal can affect dishwasher draining. | Low | Moderate | Garbage disposal parts |
Parts matching
When replacing parts, ensure they match your specific Bosch dishwasher model. Check the model number and compare it with the part specifications.
- Drain filter: Match the model number and ensure it fits the drain assembly.
- Drain hose: Check the length and diameter to match your dishwasher and sink setup.
- Drain pump: Verify the voltage and horsepower rating for compatibility.
- Drain impeller: Ensure it fits the drain pump model and has the correct size and shape.
- Control board: Match the model number and ensure it is designed for your dishwasher's electrical system.
Always consult the user manual or contact Bosch customer support for model-specific parts.
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When to call a pro
- If the dishwasher is still not draining after troubleshooting.
- When you encounter electrical issues beyond your comfort level.
- If the control board needs replacement and you are not familiar with electrical components.
- When the drain pump or impeller requires replacement and you lack the necessary tools or skills.
- If the problem persists and you are unsure about the cause.
- When the dishwasher is under warranty and professional service is covered.
FAQ
Why is my Bosch dishwasher leaving water at the bottom?
This can be due to a clogged drain filter, kinked drain hose, or a faulty drain pump. Check these components first.
How do I clean the drain filter in my Bosch dishwasher?
Locate the filter at the back of the dishwasher's bottom interior, remove it, and clean out any debris. Reassemble and run a test cycle.
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 your dishwasher and sink setup.
Can I test the drain pump myself?
Yes, you can use a multimeter to test the drain pump for continuity. Consult the user manual for specific instructions.
What if the control board is faulty?
If the control board is defective, it may need to be replaced. This is a more complex repair and may require professional assistance.
How often should I clean the drain filter?
It's a good practice to clean the drain filter every 3-6 months to prevent clogs and ensure proper draining.