Bosch Dishwasher Not Emptying: Troubleshooting Guide
Quick answer
If your Bosch dishwasher isn't emptying, check the drain hose for clogs, ensure the air gap is clear, and verify the drain pump is working. Run a diagnostic cycle to identify errors.
Confirm the symptom
- Water remains in the bottom of the dishwasher after cycles
- Dishes are not fully dry
- Dishwasher makes gurgling sounds during drain phase
- Standing water prevents the door from closing
Tools and prep
- Plunger — To clear minor clogs in the drain line
- Flexible drain snake — To remove blockages in the drain hose or disposal
- Screwdriver set — To access the dishwasher's internal components
- Flashlight — To inspect dark areas like the drain hose
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Prep & safety
- Unplug the dishwasher to ensure safety before inspecting internal components.
- Wear rubber gloves to avoid contact with dirty water or sharp edges.
Step-by-step troubleshooting
Check for Standing Water
Do: Open the dishwasher door and look for water pooling at the bottom.
Observe: Water remains after a completed cycle.
Means: Drainage issue likely exists.
Next: Inspect the drain hose for clogs.
Inspect the Drain Hose
Do: Locate the drain hose under the sink and check for kinks or blockages.
Observe: Hose is kinked or clogged with debris.
Means: Obstruction is preventing proper drainage.
Next: Use a plunger or drain snake to clear the blockage.
Check the Air Gap
Do: Look at the air gap on the sink for visible debris or blockage.
Observe: Air gap is clogged with food particles or lint.
Means: Air gap is restricting water flow.
Next: Clean the air gap with a brush or pipe cleaner.
Test the Drain Pump
Do: Listen for the drain pump running during the drain cycle.
Observe: No sound from the drain pump during operation.
Means: Pump may be faulty or disconnected.
Next: Check the pump for damage or loose connections.
Run Diagnostic Cycle
Do: Press and hold the Start/Reset button for 3 seconds to initiate a diagnostic cycle.
Observe: Error codes appear on the display.
Means: Specific error code indicates the issue.
Next: Refer to the Bosch manual for error code meanings.
Verify Drain Line Connection
Do: Ensure the drain hose is securely connected to the disposal or drain pipe.
Observe: Hose is loose or disconnected.
Means: Improper connection is causing drainage issues.
Next: Reconnect the hose and secure it with a clamp.
Check for Filter Clogs
Do: Remove and clean the dishwasher's filter at the bottom of the unit.
Observe: Filter is clogged with food particles.
Means: Clogged filter is restricting water flow.
Next: Rinse the filter thoroughly and reinstall it.
Inspect the Pump Impeller
Do: Remove the drain pump cover and check the impeller for debris.
Observe: Impeller is blocked or not spinning freely.
Means: Debris is preventing proper pump function.
Next: Clean the impeller and test the pump again.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged drain hose | Debris or food particles block water flow. | High | Low | No |
| Clogged air gap | Food particles or lint block the air gap. | Medium | Low | No |
| Faulty drain pump | Pump motor or impeller fails to operate. | Medium | High | Yes |
| Loose drain hose connection | Hose disconnects from the drain pipe. | Medium | Low | No |
| Clogged filter | Food particles block the filter. | High | Low | No |
| Blocked pump impeller | Debris prevents impeller from spinning. | Medium | Medium | No |
| Incorrect installation | Improper setup affects drainage. | Low | High | No |
| Water inlet valve issue | Valve allows water in but not out. | Low | High | Yes |
Parts matching
If replacement parts are needed, match these specifications:
- Drain pump: model number from Bosch dishwasher (e.g., 00440200, 00440199)
- Water inlet valve: compatible with Bosch model and voltage (e.g., 00440198)
- Drain hose: 3/4-inch diameter, food-grade material
- Air gap: compatible with Bosch model and sink type
Always cross-reference part numbers with your Bosch model for compatibility.
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When to call a pro
- If the drain pump is damaged and needs replacement
- If error codes persist after troubleshooting
- If water backs up into the sink or dishwasher
- If you're unable to locate or access internal components safely
- If the dishwasher is under warranty and you don't want to risk voiding it
FAQ
How do I clean the air gap on my Bosch dishwasher?
Remove the cap of the air gap, use a brush or pipe cleaner to clear debris, and rinse with water.
Can a clogged filter cause the dishwasher not to empty?
Yes, a clogged filter can restrict water flow and prevent proper drainage.
What does error code E22 mean on a Bosch dishwasher?
Error code E22 indicates a drainage issue, such as a clogged hose or faulty pump.
How often should I clean the dishwasher filter?
Clean the filter every 1-2 months to maintain optimal performance.
Is it safe to use a drain snake on the dishwasher hose?
Yes, but avoid excessive force to prevent damaging the hose.