Bosch Dishwasher: not draining completely

Professional Repair Guide

What is this symptom?

Is your Bosch dishwasher not draining completely? Water pooling at the bottom after a wash cycle can be frustrating. This issue is often due to a clogged filter, a blocked drain hose, or even a garbage disposal connection problem. Understanding the causes can help you troubleshoot and resolve the issue effectively.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch manuals and support specifically list clogging of filter and pump area as most common cause of drainage issues.
  • Bosch dishwasher error codes like E24 can indicate drain hose blockage or twist.

Possible Causes

Clogged filter or debris in internal drain system

How to Identify: Water remains in tub after cycle; visible food debris or gunk in filter area.

Part: Filter assembly, internal drain

Kinked or blocked drain hose

How to Identify: Water doesn’t leave dishwasher; drain hose may be bent, twisted, or blocked further down line; poor drainage persisting after filter cleaning.

Part: Drain hose

Garbage disposal or air gap connection blockage

How to Identify: Dishwasher drains into sink/disposal but water backs up; visible blockage at air gap or disposal inlet.

Part: Garbage disposal connection / Air gap

Check valve malfunction

How to Identify: Water backflows or remains despite clear hoses and filter; check valve stuck or faulty.

Part: Check valve

DIY Solutions

Clean filter and internal drain area

Easy 10-20 minutes
  1. Turn off dishwasher power.
  2. Remove bottom rack and locate filter assembly.
  3. Twist and lift filter to remove.
  4. Clean filter under running water, removing all debris.
  5. Reinstall filter securely and run a short drain cycle.
⚠️ Safety First: Ensure power is off before accessing internal components.

Check and clear drain hose

Moderate 20-40 minutes
Tools Needed: Bucket, Screwdriver or pliers if clamps present
  1. Turn off power and water supply.
  2. Pull dishwasher out if necessary to access back.
  3. Disconnect drain hose at sink or disposal connection into bucket.
  4. Inspect hose for kinks or blockages; straighten or clear debris.
  5. Reconnect hose securely and test drain cycle.
⚠️ Safety First: Be prepared for water in hose; wear gloves.

Inspect and clean air gap or disposal inlet

Moderate 15-30 minutes
Tools Needed: Screwdriver, Brush
  1. Locate air gap on sink top or countertop.
  2. Remove cap and clean any debris blocking opening.
  3. If connected to garbage disposal, check that knockout plug was removed during installation.
  4. Brush out inlet to improve flow.
⚠️ Safety First: Disconnect power to disposal before checking.

Professional Repairs

Replace drain pump assembly

Estimated Cost: $80 - $250

Replace drain hose or check valve

Estimated Cost: $50 - $150

When to Call a Professional

Dishwasher still does not drain after all DIY steps
Unusual noises from pump area
Visible leaks when testing drain cycle

Preventive Maintenance

  • Clean filter regularly: Filter clogs that impede drainage
    Frequency: monthly
  • Straighten and inspect drain hose: Hose kinks or hidden blockages
    Frequency: annually

Frequently Asked Questions

Why is my Bosch Dishwasher not draining completely?
Common causes include a clogged filter, blocked drain hose, or garbage disposal issues.
How do I fix Bosch Dishwasher not draining completely myself?
Clean the filter, check the drain hose for blockages, and inspect the air gap.
How much does it cost to fix not draining completely?
Professional repairs range from $50 to $250 depending on the issue.
When should I call a technician for not draining completely?
If DIY fixes don't work or if you're uncomfortable troubleshooting, it's best to call a technician.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

75%
DIY Success Rate Difficulty: DIY

Common Issues Reported by Users

  • Clogged filter or drain hose
  • Faulty drain pump
  • Backflow prevention flap malfunction

User Suggested Solutions

  1. Check and clean the filter and drain hose. Remove the bottom rack and unscrew the filter. Rinse it under warm water to remove debris. Inspect the drain hose for clogs and clear them if necessary.

  2. Test the drain pump for functionality. Access the pump by removing the lower spray arm and cover. Check for blockages and ensure the pump is operational. Replace if defective.

  3. Inspect and replace the backflow prevention flap if it is damaged or stuck. This involves removing the lower spray arm and accessing the flap to ensure it opens and closes properly.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch dishwasher intermittent incomplete draining

Community Discussions

intermittent incomplete draining

Replace the backflow prevention flap.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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