Bosch Dishwasher: not draining properly

Possible Causes

Clogged filter or debris trap

How to Identify: Standing water after cycle, visible food/debris in bottom filter area

Part: Filter assembly

Air gap or garbage disposal blockage

How to Identify: Water backs up into dishwasher or sink; visible obstruction in air gap cap or disposal inlet

Part: Air gap / disposal inlet

Faulty check valve or backflow issues

How to Identify: Dishwasher drains partially then water returns, no visible blockages elsewhere

Part: Check valve

DIY Solutions

Clean the filter and debris trap

Easy 10-20 minutes

Tools Needed: dish soap, soft brush, towel

1. Turn off dishwasher and remove lower rack
2. Locate and remove filter assembly at bottom
3. Rinse filter under warm running water and scrub away debris
4. Replace filter correctly and run a drain-only cycle

⚠️ Safety First: Ensure power is off before reaching inside

Check and clear the drain hose

Moderate 30-60 minutes

Tools Needed: screwdriver, bucket, flashlight, long brush or pipe cleaner

1. Turn off power and water supply
2. Pull dishwasher out and locate drain hose under sink
3. Disconnect hose carefully with bucket to catch water
4. Inspect for kinks and blockage; use brush/flush with water to clear
5. Reconnect hose and secure clamps; push dishwasher back and test

⚠️ Safety First: Be prepared for water spill when disconnecting hose

Clean the air gap/garbage disposal inlet

Easy 10-20 minutes

Tools Needed: screwdriver, small brush

1. Locate air gap cap near sink, remove cap
2. Clear debris with brush and run water through air gap
3. Check disposal inlet where hose connects; clear if needed
4. Reassemble and test dishwasher drain

Professional Repairs

Replace faulty drain pump

Estimated Cost: $80 - $200

Replace damaged drain hose or check valve

Estimated Cost: $30 - $100

When to Call a Professional

Water remains after all DIY checks and cleaning

Drain pump makes unusual noise or fails to operate

Internal electrical errors or dishwasher displays fault codes despite cleaning

Preventive Maintenance

• Clean filter regularly: Filter-related clogs and drainage problems
  Frequency: monthly
• Inspect drain hose and air gap: Hose blockages and improper drainage
  Frequency: biannually
• Scrape food debris off dishes before loading: Large debris clogging filter or pump
  Frequency: every use

Frequently Asked Questions

Why is my Bosch Dishwasher not draining properly?

Common causes include a clogged filter, drain hose blockage, or a faulty check valve.

How do I fix Bosch Dishwasher not draining properly myself?

Start by cleaning the filter and debris trap, then check the drain hose and air gap for blockages.

How much does it cost to fix not draining properly?

Professional repairs can range from $30 for a hose to $200 for a drain pump replacement.

When should I call a technician for not draining properly?

If DIY solutions don't work or if you're unsure about handling electrical components, it's best to call a technician.

References & Sources

• Bosch Dishwasher Not Draining Support Official

Can I Fix This Myself?

50%

DIY Success Rate Difficulty: Either

Common Issues Reported by Users

• Clogged drain tube (1 mentions)
• Faulty wash pump motor (1 mentions)

User Suggested Solutions

1. Replacing the wash pump motor

   Success rate: 50.0%

Community Discussions

water flow has severely slowed

Replacing the wash pump motor can be done relatively quickly, with some users reporting it takes about 10 minutes.

DIY View on Reddit →

Source: Reddit r/appliancerepair