Bosch Dishwasher: drain issue

Possible Causes

Clogged filter assembly or food debris in sump

How to Identify: Standing water present, debris visible around filter area at bottom of dishwasher, slow or no draining after cycle

Part: Filter assembly / sump area

Blocked or kinked drain hose

How to Identify: No draining, water backing up, visible kinks or bends in hose under sink, partial flow when hose straightened/test flushed

Part: Drain hose

Garbage disposal connection obstruction or knockout plug not removed

How to Identify: Dishwasher not draining and sink disposal backing up; suspect if recently installed disposal

Part: Garbage disposal/dishwasher drain connection

Faulty or blocked drain pump

How to Identify: Pump hums but no water movement; debris visible inside pump housing or unusual noises

Part: Drain pump

Air gap or high loop obstruction

How to Identify: Standing water in dishwasher and air gap cap clogged; high loop disconnected or too low

Part: Air gap/high loop plumbing

DIY Solutions

Clean filter and remove debris

Easy 10-15 minutes

Tools Needed: gloves, soft brush, sponge

1. Turn dishwasher off and remove bottom dish rack
2. Twist and remove filter assembly at bottom
3. Clean filter under running water and remove debris from sump with sponge
4. Reinstall filter and rack

⚠️ Safety First: Ensure power is disconnected before working inside dishwasher

Inspect and straighten/flush drain hose

Moderate 15-30 minutes

Tools Needed: flashlight, bucket, pliers

1. Turn off water and power
2. Access drain hose under sink
3. Check for kinks and straighten hose if bent
4. Disconnect hose and flush water through to clear debris
5. Reconnect hose securely

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

Clear garbage disposal connection obstruction

Moderate 10-20 minutes

Tools Needed: screwdriver

1. Check disposal connection where drain hose attaches
2. Ensure knockout plug was removed during installation
3. Run disposal to clear any obstructions
4. Reconnect hose

⚠️ Safety First: Turn off disposal and dishwasher power before working

Professional Repairs

Drain pump inspection/ replacement

Estimated Cost: $100 - $300

Air gap or high loop plumbing adjustment/repair

Estimated Cost: $50 - $150

When to Call a Professional

Drain issues persist after clearing filters, hoses, and disposal connection

Unusual noises from pump area or signs of electrical faults

Water backing up into sink or persistent leaks

Preventive Maintenance

• Clean dishwasher filter: Filter clogs leading to drain issues
  Frequency: monthly
• Inspect drain hose routing: Kinks/obstructions in hose
  Frequency: quarterly
• Run empty rinse cycle with water only occasionally: Minor buildup in drain path
  Frequency: monthly

Frequently Asked Questions

Why is my Bosch Dishwasher drain issue?

The drain issue may stem from a clogged filter, blocked drain hose, or a faulty drain pump.

How do I fix Bosch Dishwasher drain issue myself?

You can clean the filter, inspect the drain hose for kinks, or clear the garbage disposal connection.

How much does it cost to fix drain issue?

Professional repairs for drain issues range from $100 to $300 for pump inspection or replacement.

When should I call a technician for drain issue?

If DIY solutions don't resolve the problem, or if the drain pump needs inspection, it's best to call a technician.

References & Sources

• Dishwasher not draining | Bosch support Official

Can I Fix This Myself?

50%

DIY Success Rate Difficulty: Either

Common Issues Reported by Users

• Drain pump failure (2 mentions)
• Hose kinks (1 mentions)

User Suggested Solutions

1. Inspect for kinks in the hose or replace the drain pump.

   Success rate: 50.0%

2. Check the valve on the labyrinth or control module side, and inspect the power PCB.

   Success rate: 50.0%

Community Discussions

E24 code

Inspect for kinks in the hose or consider replacing the drain pump.

DIY View on Reddit →

E19 error code, drain problem

The issue may be related to the valve on the labyrinth or control module side, and could involve a shorted transistor on the power PCB.

Pro needed View on Reddit →

Source: Reddit r/appliancerepair