Bosch Washing Machine Error Code E21 - Causes and Solutions

Have you found a confusing E21 error code on your Bosch washing machine display? Don't worry - this is a common problem that you can often fix yourself without calling a service technician.

In this article, you'll learn:

• What error code E21 means
• The most common causes
• Step-by-step repair instructions
• When to call a professional

What Does Bosch Error Code E21 Mean?

Error code E21 in Bosch washing machines indicates a drainage problem. The machine has detected that water is not draining from the drum within the expected time.

This error typically occurs when:

• The drain pump is blocked
• The drain hose is clogged
• There is foreign matter in the filter

Most Common Causes

1. Clogged Drain Filter

The most common cause is a clogged drain filter. The filter collects foreign objects such as:

• Coins
• Hair clips
• Small fabric pieces
• Lint

2. Blocked Drain Hose

The drain hose can become blocked by:

• Lint buildup
• Sediment
• Kinks or bends in the hose

3. Faulty Drain Pump

If the filter and hose are clean, the problem may be with the drain pump:

• The pump impeller may be stuck
• The pump motor may be faulty
• There may be foreign matter in the pump

Step-by-Step Repair Guide

Step 1: Stop the Machine Safely

1. Press the Power button to turn off the machine
2. Wait 2 minutes for the system to reset
3. If the door is locked, wait until the drum has stopped

Step 2: Clean the Drain Filter

1. Locate the filter cover (usually bottom right)
2. Place a bowl and towels underneath
3. Open the cover slowly - water will flow out
4. Turn the filter counterclockwise and pull it out
5. Remove foreign objects and rinse the filter
6. Put the filter back and tighten

Step 3: Check the Drain Hose

1. Pull the machine away from the wall
2. Check the hose for kinks
3. Remove the hose from the drain and check for blockages
4. Rinse the hose with water

Step 4: Test the Machine

1. Select a short rinse program
2. Check that water drains normally
3. If the error returns, proceed to the next step

When to Call a Professional?

Call a service technician if:

• Cleaning doesn't help
• The pump makes unusual sounds
• The error repeats frequently
• You're uncomfortable with repair work

Prevention Tips

You can prevent E21 errors by:

• Check pockets before washing
• Clean the filter monthly
• Use the right amount of detergent - excess detergent causes buildup
• Run a hot wash occasionally (90°C) to remove grease

Frequently Asked Questions

Can I continue washing when E21 appears?

No. The machine won't start a new program until the error is cleared. Remove the water and fix the problem.

How much does drain pump repair cost?

A new drain pump typically costs $80-150 plus labor. Total cost with installation is usually around $150-250.

Is E21 covered under warranty?

If the machine is under warranty and there's no user-caused blockage, the repair may be free. Check your warranty terms.

Summary

Bosch error code E21 usually indicates a drainage problem that you can fix yourself:

1. Clean the drain filter
2. Check the drain hose
3. If the problem persists, call a professional

By regularly cleaning the filter and checking pockets before washing, you can prevent this error.

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